| Wednesday, January 15 |
| Former Athletic Charlie Gassaway dies in Miami, FL at the age of 74. |
| Saturday, March 14 |
| Former Athletic Glenn Liebhardt dies in Winston-Salem, NC at the age of 82. |
| Monday, April 6 |
| » Defeated Royals (0-1), 5-3 | Oakland-Alameda County Stadium (1-0) | 1-0 | |
| » W: Rick Honeycutt (1-0) L: Luis Aquino (0-1) S: Dennis Eckersley (1) | First | -- |
| Wednesday, April 8 |
| » Defeated Royals (0-2), 4-3 | Oakland-Alameda County Stadium (2-0) | 2-0 | Won 2 |
| » W: Jeff Parrett (1-0) L: Neal Heaton (0-1) | Second | ½ out |
| Thursday, April 9 |
| » Defeated Royals (0-3), 5-2 | Oakland-Alameda County Stadium (3-0) | 3-0 | Won 3 |
| » W: Ron Darling (1-0) L: Mark Gubicza (0-1) S: Dennis Eckersley (2) | Second | ½ out |
| Friday, April 10 |
| » Defeated White Sox (3-1), 6-5 | Oakland-Alameda County Stadium (4-0) | 4-0 | Won 4 |
| » W: Joe Slusarski (1-0) L: Alex Fernandez (0-1) S: Dennis Eckersley (3) | First | -- |
| Saturday, April 11 |
| » Defeated White Sox (3-2), 7-6 | Oakland-Alameda County Stadium (5-0) | 5-0 | Won 5 |
| » W: Jeff Parrett (2-0) L: Terry Leach (0-1) | First | -- |
| Sunday, April 12 |
| » Lost to White Sox (4-2), 6-4 | Oakland-Alameda County Stadium (5-1) | 5-1 | |
| » W: Jack McDowell (2-0) L: Gene Nelson (0-1) S: Bobby Thigpen (2) | Second | ½ out |
| Monday, April 13 |
| » Defeated Royals (0-7), 6-1 | Royals Stadium (1-0) | 6-1 | |
| » W: Mike Moore (1-0) L: Tom Gordon (0-1) | First | -- |
| Tuesday, April 14 |
| » Lost to Royals (1-7), 3-1 | Royals Stadium (1-1) | 6-2 | |
| » W: Neal Heaton (1-1) L: Rick Honeycutt (1-1) S: Jeff Montgomery (1) | First | -- |
| Wednesday, April 15 |
| » Defeated Royals (1-8), 10-6 | Royals Stadium (2-1) | 7-2 | |
| » W: Jeff Parrett (3-0) L: Mike Magnante (0-1) S: Vince Horsman (1) | First | -- |
| Thursday, April 16 |
| » Defeated Royals (1-9), 1-0 | Royals Stadium (3-1) | 8-2 | Won 2 |
| » W: Dave Stewart (1-0) L: Jeff Montgomery (0-1) S: Dennis Eckersley (4) | First | -- |
| Friday, April 17 |
| » Lost to Rangers (8-4), 6-5 | Arlington Stadium (0-1) | 8-3 | |
| » W: Kevin Brown (3-0) L: John Briscoe (0-1) S: Kenny Rogers (2) | First | -- |
| Saturday, April 18 |
| » Defeated Rangers (8-5), 5-3 | Arlington Stadium (1-1) | 9-3 | |
| » W: Mike Moore (2-0) L: Terry Mathews (0-1) S: Dennis Eckersley (5) | First | -- |
| Sunday, April 19 |
| » Lost to Rangers (9-5), 6-4 | Arlington Stadium (1-2) | 9-4 | |
| » W: Barry Manuel (1-0) L: Rick Honeycutt (1-2) S: Jeff Russell (3) | First | -- |
| Monday, April 20 |
| » Defeated Angels (7-6), 4-3 | Oakland-Alameda County Stadium (6-1) | 10-4 | |
| » W: Dennis Eckersley (1-0) L: Chuck Crim (1-1) | First | -- |
| Tuesday, April 21 |
| » Lost to Angels (8-6), 3-2 | Oakland-Alameda County Stadium (6-2) | 10-5 | |
| » W: Julio Valera (1-1) L: Dave Stewart (1-1) S: Bryan Harvey (4) | First | -- |
| Wednesday, April 22 |
| » Defeated Angels (8-7), 10-4 | Oakland-Alameda County Stadium (7-2) | 11-5 | |
| » W: Mike Moore (3-0) L: Chuck Finley (0-1) | First | -- |
| » Major-league debuts: Henry Mercedes (Athletics) |
| Thursday, April 23 |
| Former Athletic Deron Johnson dies in Poway, CA at the age of 54. Former Athletic Deron Johnson dies in Poway, CA at the age of 54. |
| Friday, April 24 |
| » Lost to Twins (7-9), 6-5 | Hubert H. Humphrey Metrodome (0-1) | 11-6 | |
| » W: Tom Edens (1-0) L: Rich Gossage (0-1) | First | -- |
| Saturday, April 25 |
| » Defeated Twins (7-10), 8-4 | Hubert H. Humphrey Metrodome (1-1) | 12-6 | |
| » W: Joe Slusarski (2-0) L: Kevin Tapani (1-2) S: Dennis Eckersley (6) | First | -- |
| Sunday, April 26 |
| » Lost to Twins (8-10), 8-4 | Hubert H. Humphrey Metrodome (1-2) | 12-7 | |
| » W: Pat Mahomes (2-0) L: Dave Stewart (1-2) S: Rick Aguilera (4) | First | -- |
| Tuesday, April 28 |
| » Defeated Indians (7-14), 3-1 | Cleveland Stadium (1-0) | 13-7 | |
| » W: Mike Moore (4-0) L: Steve Olin (0-1) S: Dennis Eckersley (7) | First | -- |
| Wednesday, April 29 |
| » Lost to Indians (8-14), 5-2 | Cleveland Stadium (1-1) | 13-8 | |
| » W: Dave Otto (2-2) L: Ron Darling (1-1) S: Steve Olin (3) | First | -- |
| Thursday, April 30 |
| » Defeated Tigers (7-14), 10-6 | Tiger Stadium (1-0) | 14-8 | |
| » W: Vince Horsman (1-0) L: Mark Leiter (2-1) S: Dennis Eckersley (8) | First | -- |
| Friday, May 1 |
| » Defeated Tigers (7-15), 7-6 | Tiger Stadium (2-0) | 15-8 | Won 2 |
| » W: Jeff Parrett (4-0) L: Mike Henneman (0-1) S: Dennis Eckersley (9) | First | -- |
| Saturday, May 2 |
| » Lost to Tigers (8-15), 5-3 | Tiger Stadium (2-1) | 15-9 | |
| » W: Frank Tanana (1-2) L: Bob Welch (0-1) S: Mike Henneman (3) | First | -- |
| Sunday, May 3 |
| » Lost to Tigers (9-15), 8-4 | Tiger Stadium (2-2) | 15-10 | Lost 2 |
| » W: Eric King (2-3) L: Mike Moore (4-1) S: Mike Henneman (4) | First | -- |
| Monday, May 4 |
| » Lost to Blue Jays (18-9), 7-3 | Oakland-Alameda County Stadium (7-3) | 15-11 | Lost 3 |
| » W: Todd Stottlemyre (4-1) L: Ron Darling (1-2) | First | -- |
| Tuesday, May 5 |
| » Lost to Blue Jays (19-9), 5-1 | Oakland-Alameda County Stadium (7-4) | 15-12 | Lost 4 |
| » W: Juan Guzman (4-0) L: Joe Slusarski (2-1) S: Duane Ward (5) | Second | 1½ out |
| Wednesday, May 6 |
| » Defeated Tigers (11-16), 5-2 | Oakland-Alameda County Stadium (8-4) | 16-12 | |
| » W: Dave Stewart (2-2) L: Walt Terrell (0-4) S: Dennis Eckersley (10) | Second | 1½ out |
| Thursday, May 7 |
| » Defeated Tigers (11-17), 6-2 | Oakland-Alameda County Stadium (9-4) | 17-12 | Won 2 |
| » W: Bob Welch (1-1) L: Frank Tanana (1-3) S: Dennis Eckersley (11) | Second | 1½ out |
| Friday, May 8 |
| » Defeated Yankees (15-14), 8-6 | Oakland-Alameda County Stadium (10-4) | 18-12 | Won 3 |
| » W: Gene Nelson (1-1) L: John Habyan (1-1) S: Dennis Eckersley (12) | Second | 1½ out |
| Saturday, May 9 |
| » Defeated Yankees (15-15), 5-3 | Oakland-Alameda County Stadium (11-4) | 19-12 | Won 4 |
| » W: Ron Darling (2-2) L: Tim Leary (3-2) S: Rick Honeycutt (1) | First | -- |
| Sunday, May 10 |
| » Defeated Yankees (15-16), 5-2 | Oakland-Alameda County Stadium (12-4) | 20-12 | Won 5 |
| » W: Joe Slusarski (3-1) L: Greg Cadaret (2-3) S: Dennis Eckersley (13) | First | -- |
| Tuesday, May 12 |
| » Lost to Blue Jays (23-11), 3-0 | Skydome (0-1) | 20-13 | |
| » W: Jimmy Key (3-1) L: Dave Stewart (2-3) S: Tom Henke (5) | First | -- |
| Wednesday, May 13 |
| » Lost to Blue Jays (24-11), 4-3 | Skydome (0-2) | 20-14 | Lost 2 |
| » W: Jack Morris (4-2) L: Mike Moore (4-2) S: Tom Henke (6) | Second | 1½ out |
| Friday, May 15 |
| » Lost to Yankees (18-16), 3-2 | Yankee Stadium (0-1) | 20-15 | Lost 3 |
| » W: Scott Kamieniecki (1-1) L: Bob Welch (1-2) S: Steve Farr (6) | Second | 1½ out |
| Saturday, May 16 |
| » Defeated Yankees (18-17), 6-3 | Yankee Stadium (1-1) | 21-15 | |
| » W: Ron Darling (3-2) L: Tim Leary (3-3) S: Dennis Eckersley (14) | First | -- |
| Sunday, May 17 |
| » Lost to Yankees (19-17), 11-2 | Yankee Stadium (1-2) | 21-16 | |
| » W: Melido Perez (4-3) L: Dave Stewart (2-4) | Second | 1½ out |
| Monday, May 18 |
| » Defeated Orioles (24-13), 8-4 | Oriole Park at Camden Yards (1-0) | 22-16 | |
| » W: Mike Moore (5-2) L: Rick Sutcliffe (5-3) | First | -- |
| Tuesday, May 19 |
| » Defeated Orioles (24-14), 5-3 | Oriole Park at Camden Yards (2-0) | 23-16 | Won 2 |
| » W: Joe Slusarski (4-1) L: Jose Mesa (1-4) S: Dennis Eckersley (15) | First | -- |
| Wednesday, May 20 |
| » Defeated Orioles (24-15), 4-2 | Oriole Park at Camden Yards (3-0) | 24-16 | Won 3 |
| » W: Bob Welch (2-2) L: Mike Mussina (5-1) S: Dennis Eckersley (16) | First | -- |
| Friday, May 22 |
| » Defeated Red Sox (19-18), 5-3 | Fenway Park (1-0) | 25-16 | Won 4 |
| » W: Dave Stewart (3-4) L: Frank Viola (5-3) S: Dennis Eckersley (17) | First | -- |
| Saturday, May 23 |
| » Lost to Red Sox (20-18), 5-1 | Fenway Park (1-1) | 25-17 | |
| » W: John Dopson (1-1) L: Mike Moore (5-3) | First | -- |
| Sunday, May 24 |
| » Defeated Red Sox (20-19), 4-0 | Fenway Park (2-1) | 26-17 | |
| » W: Ron Darling (4-2) L: Mike Gardiner (3-2) | First | -- |
| Monday, May 25 |
| » Lost to Indians (15-30), 10-6 | Oakland-Alameda County Stadium (12-5) | 26-18 | |
| » W: Charles Nagy (5-3) L: Joe Slusarski (4-2) S: Ted Power (3) | First | -- |
| Tuesday, May 26 |
| » Lost to Indians (16-30), 1-0 | Oakland-Alameda County Stadium (12-6) | 26-19 | Lost 2 |
| » W: Dave Otto (3-3) L: Bob Welch (2-3) S: Steve Olin (8) | First | -- |
| Wednesday, May 27 |
| » Lost to Indians (17-30), 4-2 | Oakland-Alameda County Stadium (12-7) | 26-20 | Lost 3 |
| » W: Scott Scudder (3-5) L: Dave Stewart (3-5) S: Steve Olin (9) | First | -- |
| Friday, May 29 |
| » Defeated Orioles (27-19), 5-3 | Oakland-Alameda County Stadium (13-7) | 27-20 | |
| » W: Mike Moore (6-3) L: Bob Milacki (4-3) S: Dennis Eckersley (18) | Second | 1½ out |
| Saturday, May 30 |
| » Lost to Orioles (28-19), 7-6 | Oakland-Alameda County Stadium (13-8) | 27-21 | |
| » W: Jose Mesa (2-5) L: Joe Slusarski (4-3) S: Gregg Olson (11) | Third | 1½ out |
| » Major-league debuts: Troy Neel (Athletics) |
| Sunday, May 31 |
| » Lost to Orioles (29-19), 4-2 | Oakland-Alameda County Stadium (13-9) | 27-22 | Lost 2 |
| » W: Rick Sutcliffe (7-4) L: Ron Darling (4-3) S: Gregg Olson (12) | Third | 1 out |
| Monday, June 1 |
| » Defeated Red Sox (24-22), 10-7 | Oakland-Alameda County Stadium (14-9) | 28-22 | |
| » W: Kevin Campbell (1-0) L: Danny Darwin (2-2) | Second | 1 out |
| Tuesday, June 2 |
| » Defeated Red Sox (24-23), 5-4 | Oakland-Alameda County Stadium (15-9) | 29-22 | Won 2 |
| » W: Mike Moore (7-3) L: Joe Hesketh (1-3) S: Dennis Eckersley (19) | First | -- |
| Wednesday, June 3 |
| » Defeated Red Sox (24-24), 7-6 | Oakland-Alameda County Stadium (16-9) | 30-22 | Won 3 |
| » W: Jeff Parrett (5-0) L: Mike Gardiner (3-4) S: Dennis Eckersley (20) | First | -- |
| Friday, June 5 |
| » Defeated White Sox (24-26), 10-3 | Comiskey Park II (1-0) | 31-22 | Won 4 |
| » W: Ron Darling (5-3) L: Kirk McCaskill (3-5) | First | -- |
| Saturday, June 6 |
| » Defeated White Sox (24-27), 6-4 | Comiskey Park II (2-0) | 32-22 | Won 5 |
| » W: Dave Stewart (4-5) L: Alex Fernandez (3-6) S: Dennis Eckersley (21) | First | -- |
| Sunday, June 7 |
| » Lost to White Sox (25-27), 6-1 | Comiskey Park II (2-1) | 32-23 | |
| » W: Charlie Hough (2-2) L: Mike Moore (7-4) | First | -- |
| Monday, June 8 |
| » Lost to Brewers (29-25), 6-2 | County Stadium (0-1) | 32-24 | Lost 2 |
| » W: Bill Wegman (6-5) L: Joe Slusarski (4-4) | First | -- |
| Tuesday, June 9 |
| » Defeated Brewers (29-26), 6-1 | County Stadium (1-1) | 33-24 | |
| » W: Kevin Campbell (2-0) L: Ron Robinson (0-2) | First | -- |
| Wednesday, June 10 |
| » Defeated Brewers (29-27), 5-2 | County Stadium (2-1) | 34-24 | Won 2 |
| » W: Ron Darling (6-3) L: Chris Bosio (4-4) S: Dennis Eckersley (22) | First | -- |
| Friday, June 12 |
| » Defeated Rangers (35-28), 6-5 | Oakland-Alameda County Stadium (17-9) | 35-24 | Won 3 |
| » W: Jim Corsi (1-0) L: Floyd Bannister (1-1) | First | -- |
| Saturday, June 13 |
| » Defeated Rangers (35-29), 7-1 | Oakland-Alameda County Stadium (18-9) | 36-24 | Won 4 |
| » W: Dave Stewart (5-5) L: Bobby Witt (7-5) | First | -- |
| Sunday, June 14 |
| » Defeated Rangers (35-30), 6-1 | Oakland-Alameda County Stadium (19-9) | 37-24 | Won 5 |
| » W: Bob Welch (3-3) L: Kevin Brown (9-4) | First | -- |
| Monday, June 15 |
| » Defeated Brewers (31-29), 3-2 | Oakland-Alameda County Stadium (20-9) | 38-24 | Won 6 |
| » W: Dennis Eckersley (2-0) L: Mike Fetters (2-1) | First | -- |
| Tuesday, June 16 |
| » Lost to Brewers (32-29), 10-0 | Oakland-Alameda County Stadium (20-10) | 38-25 | |
| » W: Ron Robinson (1-2) L: Ron Darling (6-4) | First | -- |
| Wednesday, June 17 |
| » Lost to Brewers (33-29), 10-2 | Oakland-Alameda County Stadium (20-11) | 38-26 | Lost 2 |
| » W: Jaime Navarro (7-5) L: Mike Moore (7-5) | First | -- |
| Friday, June 19 |
| » Defeated Angels (28-37), 12-8 | Anaheim Stadium (1-0) | 39-26 | |
| » W: Dave Stewart (6-5) L: Chuck Finley (2-6) S: Dennis Eckersley (23) | First | -- |
| Saturday, June 20 |
| » Lost to Angels (29-37), 10-0 | Anaheim Stadium (1-1) | 39-27 | |
| » W: Julio Valera (4-5) L: Bob Welch (3-4) | First | -- |
| Sunday, June 21 |
| » Lost to Angels (30-37), 4-2 | Anaheim Stadium (1-2) | 39-28 | Lost 2 |
| » W: Jim Abbott (3-9) L: Mike Moore (7-6) S: Joe Grahe (3) | First | -- |
| Monday, June 22 |
| » Defeated Mariners (29-40), 7-2 | Oakland-Alameda County Stadium (21-11) | 40-28 | |
| » W: Ron Darling (7-4) L: Erik Hanson (4-10) S: Dennis Eckersley (24) | First | -- |
| Tuesday, June 23 |
| » Defeated Mariners (29-41), 12-7 | Oakland-Alameda County Stadium (22-11) | 41-28 | Won 2 |
| » W: Joe Slusarski (5-4) L: Randy Kramer (0-1) | First | -- |
| Wednesday, June 24 |
| » Defeated Mariners (29-42), 7-2 | Oakland-Alameda County Stadium (23-11) | 42-28 | Won 3 |
| » W: Dave Stewart (7-5) L: Dave Fleming (10-3) | First | -- |
| Thursday, June 25 |
| » Defeated Twins (40-31), 5-1 | Oakland-Alameda County Stadium (24-11) | 43-28 | Won 4 |
| » W: Bob Welch (4-4) L: Bill Krueger (7-2) S: Dennis Eckersley (25) | First | -- |
| Friday, June 26 |
| » Lost to Twins (41-31), 4-3 | Oakland-Alameda County Stadium (24-12) | 43-29 | |
| » W: Willie Banks (2-1) L: Mike Moore (7-7) S: Rick Aguilera (22) | First | -- |
| Saturday, June 27 |
| » Lost to Twins (42-31), 12-2 | Oakland-Alameda County Stadium (24-13) | 43-30 | Lost 2 |
| » W: John Smiley (8-3) L: Ron Darling (7-5) | First | -- |
| Sunday, June 28 |
| » Lost to Twins (43-31), 10-2 | Oakland-Alameda County Stadium (24-14) | 43-31 | Lost 3 |
| » W: Scott Erickson (6-5) L: Kevin Campbell (2-1) | First | -- |
| Monday, June 29 |
| » Defeated Mariners (31-45), 5-4 | Kingdome (1-0) | 44-31 | |
| » W: Vince Horsman (2-0) L: Mike Schooler (0-5) S: Dennis Eckersley (26) | First | -- |
| Tuesday, June 30 |
| » Defeated Mariners (31-46), 4-2 | Kingdome (2-0) | 45-31 | Won 2 |
| » W: Bob Welch (5-4) L: Jeff Nelson (0-3) S: Dennis Eckersley (27) | First | -- |
| Wednesday, July 1 |
| » Defeated Mariners (31-47), 3-1 | Kingdome (3-0) | 46-31 | Won 3 |
| » W: Mike Moore (8-7) L: Mark Grant (0-1) S: Dennis Eckersley (28) | First | -- |
| Friday, July 3 |
| » Lost to Indians (32-47), 8-1 | Cleveland Stadium (1-2) | 46-32 | |
| » W: Charles Nagy (10-4) L: Ron Darling (7-6) | First | -- |
| Saturday, July 4 |
| » Lost to Indians (33-47), 8-1 | Cleveland Stadium (1-3) | 46-33 | Lost 2 |
| » W: Scott Scudder (6-7) L: Kelly Downs (1-3) S: Ted Power (4) | Second | 1 out |
| Sunday, July 5 |
| » Defeated Indians (33-48), 5-2 | Cleveland Stadium (2-3) | 47-33 | |
| » W: Bob Welch (6-4) L: Jack Armstrong (2-11) S: Dennis Eckersley (29) | Second | 1 out |
| Monday, July 6 |
| » Defeated Indians (33-49), 13-4 | Cleveland Stadium (3-3) | 48-33 | Won 2 |
| » W: Mike Moore (9-7) L: Jeff Mutis (0-1) | Second | 1 out |
| Tuesday, July 7 |
| » Lost to Tigers (39-45), 3-2 | Tiger Stadium (2-3) | 48-34 | |
| » W: Kevin Ritz (2-3) L: Ron Darling (7-7) S: Mike Henneman (14) | Second | 1 out |
| » Major-league debuts: Eric Fox (Athletics) |
| Wednesday, July 8 |
| » Lost to Tigers (40-45), 6-3 | Tiger Stadium (2-4) | 48-35 | Lost 2 |
| » W: Les Lancaster (3-2) L: Jim Corsi (1-1) S: Mike Henneman (15) | Second | 2 out |
| Thursday, July 9 |
| » Lost to Blue Jays (53-31), 4-3 | Skydome (0-3) | 48-36 | Lost 3 |
| » W: Tom Henke (3-1) L: Rich Gossage (0-2) | Second | 2 out |
| Friday, July 10 |
| » Defeated Blue Jays (53-32), 5-1 | Skydome (1-3) | 49-36 | |
| » W: Bob Welch (7-4) L: David Wells (4-4) | Second | 2 out |
| Saturday, July 11 |
| » Defeated Blue Jays (53-33), 3-1 | Skydome (2-3) | 50-36 | Won 2 |
| » W: Mike Moore (10-7) L: Juan Guzman (11-2) S: Dennis Eckersley (30) | Second | 2 out |
| Sunday, July 12 |
| » Defeated Blue Jays (53-34), 8-0 | Skydome (3-3) | 51-36 | Won 3 |
| » W: Ron Darling (8-7) L: Pat Hentgen (5-1) | Second | 2 out |
| Thursday, July 16 |
| » Defeated Tigers (41-49), 4-0 | Oakland-Alameda County Stadium (25-14) | 52-36 | Won 4 |
| » W: Kelly Downs (2-3) L: Frank Tanana (8-6) | Second | 2 out |
| Friday, July 17 |
| » Lost to Tigers (42-49), 4-3 | Oakland-Alameda County Stadium (25-15) | 52-37 | |
| » W: Bill Gullickson (10-6) L: Bob Welch (7-5) S: Kurt Knudsen (3) | Second | 3 out |
| Saturday, July 18 |
| » Lost to Tigers (43-49), 5-2 | Oakland-Alameda County Stadium (25-16) | 52-38 | Lost 2 |
| » W: Mark Leiter (6-4) L: Mike Moore (10-8) S: Buddy Groom (1) | Second | 3 out |
| Sunday, July 19 |
| » Defeated Tigers (43-50), 6-2 | Oakland-Alameda County Stadium (26-16) | 53-38 | |
| » W: Gene Nelson (2-1) L: Kevin Ritz (2-4) | Second | 3 out |
| Monday, July 20 |
| » Lost to Yankees (44-48), 1-0 | Oakland-Alameda County Stadium (26-17) | 53-39 | |
| » W: Shawn Hillegas (1-3) L: Ron Darling (8-8) | Second | 3 out |
| Tuesday, July 21 |
| » Lost to Yankees (45-48), 5-1 | Oakland-Alameda County Stadium (26-18) | 53-40 | Lost 2 |
| » W: Melido Perez (9-8) L: Kelly Downs (2-4) | Second | 3 out |
| Wednesday, July 22 |
| » Defeated Yankees (45-49), 8-5 | Oakland-Alameda County Stadium (27-18) | 54-40 | |
| » W: Jeff Parrett (6-0) L: John Habyan (3-4) S: Dennis Eckersley (31) | Second | 3 out |
| Thursday, July 23 |
| » Lost to Blue Jays (58-37), 9-3 | Oakland-Alameda County Stadium (27-19) | 54-41 | |
| » W: Dave Stieb (4-6) L: Mike Moore (10-9) | Second | 3½ out |
| Friday, July 24 |
| » Defeated Blue Jays (58-38), 6-5 | Oakland-Alameda County Stadium (28-19) | 55-41 | |
| » W: Dennis Eckersley (3-0) L: Tom Henke (3-2) | Second | 3 out |
| Saturday, July 25 |
| » Defeated Blue Jays (58-39), 6-0 | Oakland-Alameda County Stadium (29-19) | 56-41 | Won 2 |
| » W: Ron Darling (9-8) L: Todd Stottlemyre (5-7) | Second | 3 out |
| Sunday, July 26 |
| » Defeated Blue Jays (58-40), 9-1 | Oakland-Alameda County Stadium (30-19) | 57-41 | Won 3 |
| » W: Kelly Downs (3-4) L: Jack Morris (12-4) | Second | 3 out |
| Monday, July 27 |
| » Defeated Twins (60-39), 9-1 | Hubert H. Humphrey Metrodome (2-2) | 58-41 | Won 4 |
| » W: Bob Welch (8-5) L: John Smiley (10-5) | Second | 2 out |
| Tuesday, July 28 |
| » Defeated Twins (60-40), 12-10 | Hubert H. Humphrey Metrodome (3-2) | 59-41 | Won 5 |
| » W: Gene Nelson (3-1) L: Tom Edens (5-1) S: Dennis Eckersley (32) | Second | 1 out |
| Wednesday, July 29 |
| » Defeated Twins (60-41), 5-4 | Hubert H. Humphrey Metrodome (4-2) | 60-41 | Won 6 |
| » W: Jeff Parrett (7-0) L: Rick Aguilera (1-5) S: Dennis Eckersley (33) | First | -- |
| Friday, July 31 |
| » Lost to Royals (45-57), 6-5 | Royals Stadium (3-2) | 60-42 | |
| » W: Rusty Meacham (5-3) L: Jeff Parrett (7-1) | Second | ½ out |
| Saturday, August 1 |
| » Lost to Royals (46-57), 8-4 | Royals Stadium (3-3) | 60-43 | Lost 2 |
| » W: Tom Gordon (4-9) L: Kelly Downs (3-5) | Second | 1½ out |
| Sunday, August 2 |
| » Defeated Royals (46-58), 8-4 | Royals Stadium (4-3) | 61-43 | |
| » W: Bob Welch (9-5) L: Juan Berenguer (3-2) | Second | 1½ out |
| Monday, August 3 |
| » Defeated Rangers (55-53), 4-1 | Arlington Stadium (2-2) | 62-43 | Won 2 |
| » W: Mike Moore (11-9) L: Jose Guzman (8-9) S: Dennis Eckersley (34) | Second | 1 out |
| Tuesday, August 4 |
| » Defeated Rangers (55-54), 9-0 | Arlington Stadium (3-2) | 63-43 | Won 3 |
| » W: Dave Stewart (8-5) L: Brian Bohanon (1-1) S: Kevin Campbell (1) | First | -- |
| Wednesday, August 5 |
| » Defeated Rangers (55-55), 4-3 | Arlington Stadium (4-2) | 64-43 | Won 4 |
| » W: Ron Darling (10-8) L: Bobby Witt (9-9) S: Dennis Eckersley (35) | First | -- |
| » Major-league debuts: Matt Whiteside (Rangers) |
| Thursday, August 6 |
| » Defeated Rangers (55-56), 2-0 | Arlington Stadium (5-2) | 65-43 | Won 5 |
| » W: Kelly Downs (4-5) L: Nolan Ryan (5-5) S: Rick Honeycutt (2) | First | -- |
| Friday, August 7 |
| » Defeated Royals (49-60), 8-6 | Oakland-Alameda County Stadium (31-19) | 66-43 | Won 6 |
| » W: Bob Welch (10-5) L: Dennis Moeller (0-2) S: Dennis Eckersley (36) | First | -- |
| Saturday, August 8 |
| » Defeated Royals (49-61), 5-3 | Oakland-Alameda County Stadium (32-19) | 67-43 | Won 7 |
| » W: Dennis Eckersley (4-0) L: Jeff Montgomery (1-6) | First | -- |
| Sunday, August 9 |
| » Lost to Royals (50-61), 5-2 | Oakland-Alameda County Stadium (32-20) | 67-44 | |
| » W: Kevin Appier (13-4) L: Dave Stewart (8-6) S: Jeff Montgomery (28) | First | -- |
| Monday, August 10 |
| » Defeated White Sox (57-53), 5-3 | Oakland-Alameda County Stadium (33-20) | 68-44 | |
| » W: Ron Darling (11-8) L: Charlie Hough (5-8) S: Dennis Eckersley (37) | First | -- |
| Tuesday, August 11 |
| » Lost to White Sox (58-53), 10-6 | Oakland-Alameda County Stadium (33-21) | 68-45 | |
| » W: Roberto Hernandez (5-2) L: Rick Honeycutt (1-3) S: Scott Radinsky (10) | First | -- |
| Wednesday, August 12 |
| » Defeated White Sox (58-54), 2-1 | Oakland-Alameda County Stadium (34-21) | 69-45 | |
| » W: Dennis Eckersley (5-0) L: Jack McDowell (15-7) | First | -- |
| Thursday, August 13 |
| » Defeated Angels (52-64), 4-1 | Oakland-Alameda County Stadium (35-21) | 70-45 | Won 2 |
| » W: Mike Moore (12-9) L: Jim Abbott (4-12) | First | -- |
| » Major-league debuts: Damion Easley (Angels) |
| Friday, August 14 |
| » Lost to Angels (53-64), 2-1 | Oakland-Alameda County Stadium (35-22) | 70-46 | |
| » W: Bert Blyleven (6-5) L: Dave Stewart (8-7) S: Joe Grahe (14) | First | -- |
| Saturday, August 15 |
| » Defeated Angels (53-65), 9-5 | Oakland-Alameda County Stadium (36-22) | 71-46 | |
| » W: Jim Corsi (2-1) L: Chuck Crim (6-5) | First | -- |
| » Major-league debuts: Mike Raczka (Athletics) |
| Sunday, August 16 |
| » Defeated Angels (53-66), 5-4 | Oakland-Alameda County Stadium (37-22) | 72-46 | Won 2 |
| » W: Dennis Eckersley (6-0) L: Joe Grahe (4-4) | First | -- |
| Tuesday, August 18 |
| » Lost to Yankees (54-65), 7-3 | Yankee Stadium (1-3) | 72-47 | |
| » W: Scott Sanderson (11-8) L: Mike Moore (12-10) S: Steve Farr (18) | First | -- |
| Wednesday, August 19 |
| » Lost to Yankees (55-65), 14-3 | Yankee Stadium (1-4) | 72-48 | Lost 2 |
| » W: Scott Kamieniecki (3-10) L: Dave Stewart (8-8) | First | -- |
| Thursday, August 20 |
| » Defeated Yankees (55-66), 8-6 | Yankee Stadium (2-4) | 73-48 | |
| » W: Jeff Parrett (8-1) L: Steve Farr (1-2) S: Dennis Eckersley (38) | First | -- |
| Friday, August 21 |
| » Lost to Orioles (68-54), 4-2 | Oriole Park at Camden Yards (3-1) | 73-49 | |
| » W: Mike Mussina (12-5) L: Kelly Downs (4-6) S: Alan Mills (2) | First | -- |
| Saturday, August 22 |
| » Defeated Orioles (68-55), 5-3 | Oriole Park at Camden Yards (4-1) | 74-49 | |
| » W: Jeff Parrett (9-1) L: Richie Lewis (1-1) S: Dennis Eckersley (39) | First | -- |
| Sunday, August 23 |
| » Defeated Orioles (68-56), 7-3 | Oriole Park at Camden Yards (5-1) | 75-49 | Won 2 |
| » W: Mike Moore (13-10) L: Ben McDonald (12-9) S: Dennis Eckersley (40) | First | -- |
| Monday, August 24 |
| » Defeated Red Sox (56-69), 9-3 | Fenway Park (3-1) | 76-49 | Won 3 |
| » W: Dave Stewart (9-8) L: John Dopson (6-6) | First | -- |
| » Major-league debuts: Todd Revenig (Athletics) |
| Tuesday, August 25 |
| » Lost to Red Sox (57-69), 5-4 | Fenway Park (3-2) | 76-50 | |
| » W: Paul Quantrill (2-2) L: Dennis Eckersley (6-1) S: Jeff Reardon (27) | First | -- |
| Wednesday, August 26 |
| » Lost to Red Sox (58-69), 2-1 | Fenway Park (3-3) | 76-51 | Lost 2 |
| » W: Frank Viola (11-10) L: Kevin Campbell (2-2) | First | -- |
| Friday, August 28 |
| » Defeated Indians (59-69), 7-6 | Oakland-Alameda County Stadium (38-22) | 77-51 | |
| » W: Jim Corsi (3-1) L: Jack Armstrong (5-14) S: Dennis Eckersley (41) | First | -- |
| Saturday, August 29 |
| » Defeated Indians (59-70), 4-1 | Oakland-Alameda County Stadium (39-22) | 78-51 | Won 2 |
| » W: Dave Stewart (10-8) L: Jose Mesa (5-10) S: Dennis Eckersley (42) | First | -- |
| Sunday, August 30 |
| » Defeated Indians (59-71), 7-5 | Oakland-Alameda County Stadium (40-22) | 79-51 | Won 3 |
| » W: Ron Darling (12-8) L: Charles Nagy (13-10) S: Rick Honeycutt (3) | First | -- |
| Monday, August 31 |
| » Lost to Orioles (73-58), 4-0 | Oakland-Alameda County Stadium (40-23) | 79-52 | |
| » W: Mike Mussina (13-5) L: Kelly Downs (4-7) | First | -- |
| Tuesday, September 1 |
| » Lost to Orioles (74-58), 5-1 | Oakland-Alameda County Stadium (40-24) | 79-53 | Lost 2 |
| » W: Bob Milacki (6-7) L: Joe Slusarski (5-5) | First | -- |
| Wednesday, September 2 |
| » Lost to Orioles (75-58), 2-1 | Oakland-Alameda County Stadium (40-25) | 79-54 | Lost 3 |
| » W: Alan Mills (9-3) L: Rick Honeycutt (1-4) | First | -- |
| Friday, September 4 |
| » Lost to Red Sox (62-72), 8-3 | Oakland-Alameda County Stadium (40-26) | 79-55 | Lost 4 |
| » W: Danny Darwin (8-6) L: Dave Stewart (10-9) | First | -- |
| Saturday, September 5 |
| » Lost to Red Sox (63-72), 7-3 | Oakland-Alameda County Stadium (40-27) | 79-56 | Lost 5 |
| » W: John Dopson (7-7) L: Ron Darling (12-9) | First | -- |
| Sunday, September 6 |
| » Defeated Red Sox (63-73), 2-1 | Oakland-Alameda County Stadium (41-27) | 80-56 | |
| » W: Dennis Eckersley (7-1) L: Paul Quantrill (2-3) | First | -- |
| Monday, September 7 |
| » Lost to Angels (63-75), 3-2 | Anaheim Stadium (1-3) | 80-57 | |
| » W: Julio Valera (7-9) L: Mike Moore (13-11) S: Joe Grahe (20) | First | -- |
| Tuesday, September 8 |
| » Defeated Angels (63-76), 14-2 | Anaheim Stadium (2-3) | 81-57 | |
| » W: Kelly Downs (5-7) L: Chuck Finley (4-12) | First | -- |
| » Major-league debuts: Hilly Hathaway and Reggie Williams (Angels) |
| Wednesday, September 9 |
| » Defeated Angels (63-77), 3-0 | Anaheim Stadium (3-3) | 82-57 | Won 2 |
| » W: Dave Stewart (11-9) L: Mark Langston (12-13) S: Dennis Eckersley (43) | First | -- |
| Thursday, September 10 |
| » Defeated Mariners (56-85), 6-4 | Oakland-Alameda County Stadium (42-27) | 83-57 | Won 3 |
| » W: Ron Darling (13-9) L: Randy Johnson (11-13) S: Dennis Eckersley (44) | First | -- |
| Friday, September 11 |
| » Defeated Mariners (56-86), 4-3 | Oakland-Alameda County Stadium (43-27) | 84-57 | Won 4 |
| » W: Jeff Russell (3-3) L: Jeff Nelson (1-5) | First | -- |
| Saturday, September 12 |
| » Defeated Mariners (56-87), 5-4 | Oakland-Alameda County Stadium (44-27) | 85-57 | Won 5 |
| » W: Mike Moore (14-11) L: Tim Leary (6-9) S: Dennis Eckersley (45) | First | -- |
| Sunday, September 13 |
| » Defeated Mariners (56-88), 3-1 | Oakland-Alameda County Stadium (45-27) | 86-57 | Won 6 |
| » W: Kelly Downs (6-7) L: Erik Hanson (8-16) S: Jeff Russell (29) | First | -- |
| Monday, September 14 |
| » Defeated Twins (80-64), 3-2 | Oakland-Alameda County Stadium (46-27) | 87-57 | Won 7 |
| » W: Jim Corsi (4-1) L: Tom Edens (5-3) S: Dennis Eckersley (46) | First | -- |
| Tuesday, September 15 |
| » Defeated Twins (80-65), 2-1 | Oakland-Alameda County Stadium (47-27) | 88-57 | Won 8 |
| » W: Ron Darling (14-9) L: Pat Mahomes (3-3) S: Dennis Eckersley (47) | First | -- |
| » Major-league debuts: Bernardo Brito (Twins) |
| Wednesday, September 16 |
| » Defeated Twins (80-66), 4-2 | Oakland-Alameda County Stadium (48-27) | 89-57 | Won 9 |
| » W: Bobby Witt (10-13) L: John Smiley (14-9) S: Jeff Russell (30) | First | -- |
| Friday, September 18 |
| » Defeated Mariners (56-91), 7-4 | Kingdome (4-0) | 90-57 | Won 10 |
| » W: Mike Moore (15-11) L: Brian Fisher (2-2) S< |