| Friday, January 1 |
| Former Senator Harry Rice dies in Portland, OR at the age of 70. |
| Monday, February 8 |
| Former Senator Bobby Burke dies in Joliet, IL at the age of 65. |
| Monday, April 5 |
| » Defeated Athletics (0-1), 8-0 | Robert F. Kennedy Stadium (1-0) | 1-0 | |
| » Starters: Vida Blue vs Dick Bosman | First | -- |
| Wednesday, April 7 |
| » Lost to Orioles (1-0), 3-2 | Memorial Stadium (0-1) | 1-1 | |
| » Starters: Casey Cox vs Dave McNally | Second | ½ out |
| Friday, April 9 |
| » Defeated Yankees (0-2), 5-4 | Robert F. Kennedy Stadium (2-0) | 2-1 | |
| » Starters: Fritz Peterson vs Denny McLain | Second | ½ out |
| Saturday, April 10 |
| » Lost to Yankees (1-2), 6-0 | Robert F. Kennedy Stadium (2-1) | 2-2 | |
| » Starters: Mel Stottlemyre vs Jim Shellenback | Third | 1½ out |
| Sunday, April 11 |
| » Lost to Yankees (2-2), 1-0 | Robert F. Kennedy Stadium (2-2) | 2-3 | Lost 2 |
| » Starters: Steve Kline vs Dick Bosman | Third | 1½ out |
| » Defeated Yankees (2-3), 4-3 | Robert F. Kennedy Stadium (3-2) | 3-3 | |
| » Starters: Mike Kekich vs Casey Cox | Third | 1½ out |
| Monday, April 12 |
| » Lost to Red Sox (2-3), 10-7 | Robert F. Kennedy Stadium (3-3) | 3-4 | |
| » Starters: Ray Culp vs Jerry Janeski | Third | 2 out |
| Tuesday, April 13 |
| » Lost to Red Sox (3-3), 5-3 | Robert F. Kennedy Stadium (3-4) | 3-5 | Lost 2 |
| » Starters: Sonny Siebert vs Denny McLain | Fourth | 2½ out |
| Wednesday, April 14 |
| » Defeated Red Sox (3-4), 6-5 | Robert F. Kennedy Stadium (4-4) | 4-5 | |
| » Starters: Mike Nagy vs Jim Shellenback | Fourth | 2½ out |
| Thursday, April 15 |
| Former Senator Mickey Harris dies in Farmington, MI at the age of 55. |
| Saturday, April 17 |
| » Defeated Indians (3-4), 5-3 | Cleveland Stadium (1-0) | 5-5 | Won 2 |
| » Starters: Dick Bosman vs Steve Hargan | Second | 2½ out |
| Sunday, April 18 |
| » Defeated Indians (3-5), 4-0 | Cleveland Stadium (2-0) | 6-5 | Won 3 |
| » Starters: Denny McLain vs Sam McDowell | Third | 3 out |
| » Lost to Indians (4-5), 1-0 | Cleveland Stadium (2-1) | 6-6 | |
| » Starters: Casey Cox vs Steve Dunning | Third | 3 out |
| Tuesday, April 20 |
| » Defeated Yankees (5-7), 7-2 | Yankee Stadium (1-0) | 7-6 | |
| » Starters: Jim Shellenback vs Fritz Peterson | Second | 2 out |
| Wednesday, April 21 |
| » Defeated Yankees (5-8), 9-6 | Yankee Stadium (2-0) | 8-6 | Won 2 |
| » Starters: Dick Bosman vs Mel Stottlemyre | Second | 1 out |
| Friday, April 23 |
| » Lost to Brewers (7-7), 4-0 | Robert F. Kennedy Stadium (4-5) | 8-7 | |
| » Starters: Bill Parsons vs Denny McLain | Third | 2 out |
| Saturday, April 24 |
| » Defeated Brewers (7-8), 5-4 | Robert F. Kennedy Stadium (5-5) | 9-7 | |
| » Starters: Lew Krausse vs Casey Cox | Third | 1 out |
| Sunday, April 25 |
| » Defeated Brewers (7-9), 3-2 | Robert F. Kennedy Stadium (6-5) | 10-7 | Won 2 |
| » Starters: Skip Lockwood vs Dick Bosman | Third | 1 out |
| Monday, April 26 |
| » Lost to Twins (9-9), 7-2 | Robert F. Kennedy Stadium (6-6) | 10-8 | |
| » Starters: Jim Perry vs Jim Shellenback | Second | 1 out |
| Tuesday, April 27 |
| » Defeated Twins (9-10), 2-0 | Robert F. Kennedy Stadium (7-6) | 11-8 | |
| » Starters: Bert Blyleven vs Denny McLain | Third | 1 out |
| Wednesday, April 28 |
| » Defeated Twins (9-11), 4-3 | Robert F. Kennedy Stadium (8-6) | 12-8 | Won 2 |
| » Starters: Tom Hall vs Casey Cox | Second | 1 out |
| Thursday, April 29 |
| » Lost to White Sox (7-13), 5-4 | Robert F. Kennedy Stadium (8-7) | 12-9 | |
| » Starters: Tom Bradley vs Dick Bosman | Third | 1 out |
| Friday, April 30 |
| » Lost to White Sox (8-13), 8-1 | Robert F. Kennedy Stadium (8-8) | 12-10 | Lost 2 |
| » Starters: Bart Johnson vs Jerry Janeski | Third | 1½ out |
| Saturday, May 1 |
| » Lost to White Sox (9-13), 5-3 | Robert F. Kennedy Stadium (8-9) | 12-11 | Lost 3 |
| » Starters: Tommy John vs Denny McLain | Third | 1½ out |
| Sunday, May 2 |
| » Lost to White Sox (10-13), 3-1 | Robert F. Kennedy Stadium (8-10) | 12-12 | Lost 4 |
| » Starters: Wilbur Wood vs Casey Cox | Third | 3 out |
| Tuesday, May 4 |
| » Lost to Brewers (10-13), 2-0 | County Stadium (0-1) | 12-13 | Lost 5 |
| » Starters: Dick Bosman vs Bill Parsons | Third | 4 out |
| Wednesday, May 5 |
| » Lost to Brewers (11-13), 4-3 | County Stadium (0-2) | 12-14 | Lost 6 |
| » Starters: Denny McLain vs Skip Lockwood | Third | 4½ out |
| Friday, May 7 |
| » Defeated Twins (13-15), 6-5 | Metropolitan Stadium (1-0) | 13-14 | |
| » Starters: Casey Cox vs Bert Blyleven | Third | 5 out |
| Saturday, May 8 |
| » Lost to Twins (14-15), 9-2 | Metropolitan Stadium (1-1) | 13-15 | |
| » Starters: Dick Bosman vs Jim Kaat | Fourth | 6 out |
| Sunday, May 9 |
| » Lost to Twins (15-15), 6-5 | Metropolitan Stadium (1-2) | 13-16 | Lost 2 |
| » Starters: Denny McLain vs Jim Perry | Fourth | 6 out |
| Wednesday, May 12 |
| » Lost to White Sox (11-18), 5-0 | Comiskey Park I (0-1) | 13-17 | Lost 3 |
| » Starters: Dick Bosman vs Tom Bradley | Fifth | 7 out |
| » Lost to White Sox (12-18), 9-5 | Comiskey Park I (0-2) | 13-18 | Lost 4 |
| » Starters: Casey Cox vs Bart Johnson | Fifth | 7 out |
| Former Senator Heinie Manush dies in Sarasota, FL at the age of 70. |
| Friday, May 14 |
| » Defeated Tigers (15-16), 3-2 | Robert F. Kennedy Stadium (9-10) | 14-18 | |
| » Starters: Bill Zepp vs Denny McLain | Fifth | 7 out |
| Saturday, May 15 |
| » Defeated Tigers (15-17), 4-3 | Robert F. Kennedy Stadium (10-10) | 15-18 | Won 2 |
| » Starters: Mickey Lolich vs Jerry Janeski | Fifth | 6 out |
| Former Senator Goose Goslin dies in Bridgeton, NJ at the age of 71. |
| Sunday, May 16 |
| » Lost to Tigers (16-17), 5-4 | Robert F. Kennedy Stadium (10-11) | 15-19 | |
| » Starters: Joe Coleman vs Casey Cox | Fifth | 6½ out |
| Monday, May 17 |
| » Lost to Indians (13-20), 6-3 | Robert F. Kennedy Stadium (10-12) | 15-20 | Lost 2 |
| » Starters: Steve Dunning vs Dick Bosman | Fifth | 7½ out |
| Tuesday, May 18 |
| » Lost to Indians (14-20), 7-3 | Robert F. Kennedy Stadium (10-13) | 15-21 | Lost 3 |
| » Starters: Sam McDowell vs Denny McLain | Fifth | 8½ out |
| Wednesday, May 19 |
| » Lost to Orioles (21-14), 4-1 | Robert F. Kennedy Stadium (10-14) | 15-22 | Lost 4 |
| » Starters: Jim Palmer vs Mike Thompson | Fifth | 9½ out |
| » Major-league debuts: Mike Thompson (Senators) |
| Friday, May 21 |
| » Lost to Tigers (19-19), 1-0 | Tiger Stadium (0-1) | 15-23 | Lost 5 |
| » Starters: Jerry Janeski vs Dean Chance | Sixth | 11 out |
| Saturday, May 22 |
| » Lost to Tigers (20-19), 3-1 | Tiger Stadium (0-2) | 15-24 | Lost 6 |
| » Starters: Dick Bosman vs Bill Zepp | Sixth | 11 out |
| Sunday, May 23 |
| » Lost to Tigers (21-19), 5-0 | Tiger Stadium (0-3) | 15-25 | Lost 7 |
| » Starters: Denny McLain vs Mickey Lolich | Sixth | 12 out |
| » Lost to Tigers (22-19), 11-0 | Tiger Stadium (0-4) | 15-26 | Lost 8 |
| » Starters: Mike Thompson vs Les Cain | Sixth | 12 out |
| Monday, May 24 |
| » Defeated Red Sox (26-14), 8-6 | Fenway Park (1-0) | 16-26 | |
| » Starters: Casey Cox vs Bill Lee | Sixth | 11 out |
| Tuesday, May 25 |
| » Defeated Red Sox (26-15), 6-5 | Fenway Park (2-0) | 17-26 | Won 2 |
| » Starters: Bill Gogolewski vs Jim Lonborg | Fifth | 10 out |
| Wednesday, May 26 |
| » Lost to Red Sox (27-15), 3-2 | Fenway Park (2-1) | 17-27 | |
| » Starters: Jerry Janeski vs Ray Culp | Sixth | 11 out |
| Thursday, May 27 |
| » Lost to Red Sox (28-15), 6-2 | Fenway Park (2-2) | 17-28 | Lost 2 |
| » Starters: Dick Bosman vs Gary Peters | Fifth | 12 out |
| Friday, May 28 |
| » Lost to Royals (21-22), 5-0 | Robert F. Kennedy Stadium (10-15) | 17-29 | Lost 3 |
| » Starters: Ken Wright vs Denny McLain | Sixth | 13 out |
| Monday, May 31 |
| » Defeated Angels (23-27), 4-0 | Robert F. Kennedy Stadium (11-15) | 18-29 | |
| » Starters: Tom Murphy vs Mike Thompson | Sixth | 11 out |
| Tuesday, June 1 |
| » Defeated Angels (23-28), 6-5 | Robert F. Kennedy Stadium (12-15) | 19-29 | Won 2 |
| » Starters: Jim Maloney vs Dick Bosman | Sixth | 10 out |
| Wednesday, June 2 |
| » Lost to Angels (24-28), 2-1 | Robert F. Kennedy Stadium (12-16) | 19-30 | |
| » Starters: Clyde Wright vs Denny McLain | Sixth | 10 out |
| Friday, June 4 |
| » Lost to Athletics (35-18), 5-3 | Robert F. Kennedy Stadium (12-17) | 19-31 | Lost 2 |
| » Starters: Chuck Dobson vs Jerry Janeski | Sixth | 11½ out |
| Saturday, June 5 |
| » Lost to Athletics (36-18), 6-1 | Robert F. Kennedy Stadium (12-18) | 19-32 | Lost 3 |
| » Starters: Catfish Hunter vs Dick Bosman | Sixth | 12 out |
| Sunday, June 6 |
| » Lost to Athletics (37-18), 8-1 | Robert F. Kennedy Stadium (12-19) | 19-33 | Lost 4 |
| » Starters: Vida Blue vs Denny McLain | Sixth | 13 out |
| Tuesday, June 8 |
| » Lost to Royals (27-23), 4-2 | Municipal Stadium (0-1) | 19-34 | Lost 5 |
| » Starters: Casey Cox vs Paul Splittorff | Sixth | 14 out |
| Wednesday, June 9 |
| » Lost to Royals (28-23), 5-4 | Municipal Stadium (0-2) | 19-35 | Lost 6 |
| » Starters: Jerry Janeski vs Mike Hedlund | Sixth | 15 out |
| Friday, June 11 |
| » Lost to Angels (28-31), 4-2 | Anaheim Stadium (0-1) | 19-36 | Lost 7 |
| » Starters: Denny McLain vs Clyde Wright | Sixth | 16½ out |
| Saturday, June 12 |
| » Defeated Angels (28-32), 3-2 | Anaheim Stadium (1-1) | 20-36 | |
| » Starters: Dick Bosman vs Andy Hassler | Sixth | 15½ out |
| Sunday, June 13 |
| » Defeated Angels (28-33), 5-2 | Anaheim Stadium (2-1) | 21-36 | Won 2 |
| » Starters: Jackie Brown vs Jim Maloney | Sixth | 15½ out |
| Tuesday, June 15 |
| » Lost to Athletics (40-21), 8-2 | Oakland-Alameda County Stadium (0-1) | 21-37 | |
| » Starters: Jerry Janeski vs Chuck Dobson | Sixth | 15½ out |
| Wednesday, June 16 |
| » Lost to Athletics (41-21), 5-1 | Oakland-Alameda County Stadium (0-2) | 21-38 | Lost 2 |
| » Starters: Denny McLain vs Vida Blue | Sixth | 16½ out |
| » Major-league debuts: Lenny Randle (Senators) |
| Friday, June 18 |
| » Defeated Red Sox (34-28), 8-5 | Robert F. Kennedy Stadium (13-19) | 22-38 | |
| » Starters: Sonny Siebert vs Dick Bosman | Sixth | 17 out |
| Saturday, June 19 |
| » Defeated Red Sox (34-29), 2-0 | Robert F. Kennedy Stadium (14-19) | 23-38 | Won 2 |
| » Starters: Ray Culp vs Jackie Brown | Sixth | 16 out |
| Sunday, June 20 |
| » Lost to Red Sox (35-29), 4-3 | Robert F. Kennedy Stadium (14-20) | 23-39 | |
| » Starters: Gary Peters vs Pete Broberg | Sixth | 17 out |
| » Major-league debuts: Pete Broberg (Senators) |
| Monday, June 21 |
| » Lost to Orioles (41-22), 7-2 | Robert F. Kennedy Stadium (14-21) | 23-40 | Lost 2 |
| » Starters: Pat Dobson vs Denny McLain | Sixth | 18 out |
| Tuesday, June 22 |
| » Defeated Orioles (41-23), 8-6 | Robert F. Kennedy Stadium (15-21) | 24-40 | |
| » Starters: Mike Cuellar vs Jerry Janeski | Sixth | 18 out |
| » Lost to Orioles (42-23), 2-0 | Robert F. Kennedy Stadium (15-22) | 24-41 | |
| » Starters: Grant Jackson vs Jim Shellenback | Sixth | 18 out |
| Wednesday, June 23 |
| » Lost to Orioles (43-23), 7-5 | Robert F. Kennedy Stadium (15-23) | 24-42 | Lost 2 |
| » Starters: Jim Palmer vs Dick Bosman | Sixth | 19 out |
| Thursday, June 24 |
| » Lost to Orioles (44-23), 6-1 | Robert F. Kennedy Stadium (15-24) | 24-43 | Lost 3 |
| » Starters: Dave McNally vs Jackie Brown | Sixth | 20 out |
| Friday, June 25 |
| » Lost to Yankees (33-37), 12-2 | Yankee Stadium (2-1) | 24-44 | Lost 4 |
| » Starters: Pete Broberg vs Steve Kline | Sixth | 21 out |
| Saturday, June 26 |
| » Lost to Yankees (34-37), 4-0 | Yankee Stadium (2-2) | 24-45 | Lost 5 |
| » Starters: Denny McLain vs Mel Stottlemyre | Sixth | 20½ out |
| Sunday, June 27 |
| » Defeated Yankees (34-38), 2-1 | Yankee Stadium (3-2) | 25-45 | |
| » Starters: Jerry Janeski vs Stan Bahnsen | Sixth | 19 out |
| » Defeated Yankees (34-39), 8-0 | Yankee Stadium (4-2) | 26-45 | Won 2 |
| » Starters: Jim Shellenback vs Mike Kekich | Sixth | 19 out |
| Monday, June 28 |
| » Lost to Red Sox (41-31), 10-4 | Fenway Park (2-3) | 26-46 | |
| » Starters: Jackie Brown vs Luis Tiant | Sixth | 19 out |
| Tuesday, June 29 |
| » Lost to Red Sox (42-31), 6-2 | Fenway Park (2-4) | 26-47 | Lost 2 |
| » Starters: Pete Broberg vs Jim Lonborg | Sixth | 20 out |
| Wednesday, June 30 |
| » Defeated Yankees (35-42), 2-1 | Robert F. Kennedy Stadium (16-24) | 27-47 | |
| » Starters: Mel Stottlemyre vs Denny McLain | Sixth | 19½ out |
| Thursday, July 1 |
| » Defeated Yankees (35-43), 3-1 | Robert F. Kennedy Stadium (17-24) | 28-47 | Won 2 |
| » Starters: Mike Kekich vs Jim Shellenback | Sixth | 18½ out |
| Friday, July 2 |
| » Defeated Indians (36-42), 6-3 | Cleveland Stadium (3-1) | 29-47 | Won 3 |
| » Starters: Dick Bosman vs Ray Lamb | Sixth | 17½ out |
| Saturday, July 3 |
| » Defeated Indians (36-43), 4-3 | Cleveland Stadium (4-1) | 30-47 | Won 4 |
| » Starters: Jackie Brown vs Alan Foster | Sixth | 17½ out |
| Sunday, July 4 |
| » Defeated Indians (36-44), 9-4 | Cleveland Stadium (5-1) | 31-47 | Won 5 |
| » Starters: Pete Broberg vs Steve Dunning | Sixth | 17½ out |
| Monday, July 5 |
| » Defeated Indians (36-45), 15-6 | Cleveland Stadium (6-1) | 32-47 | Won 6 |
| » Starters: Denny McLain vs Steve Hargan | Sixth | 17 out |
| Tuesday, July 6 |
| » Lost to Orioles (50-30), 6-2 | Memorial Stadium (0-2) | 32-48 | |
| » Starters: Jim Shellenback vs Dave McNally | Sixth | 17 out |
| » Defeated Orioles (50-31), 3-2 | Memorial Stadium (1-2) | 33-48 | |
| » Starters: Bill Gogolewski vs Grant Jackson | Sixth | 17 out |
| Wednesday, July 7 |
| » Lost to Orioles (51-31), 4-0 | Memorial Stadium (1-3) | 33-49 | |
| » Starters: Dick Bosman vs Pat Dobson | Sixth | 18 out |
| Thursday, July 8 |
| » Lost to Orioles (52-31), 7-3 | Memorial Stadium (1-4) | 33-50 | Lost 2 |
| » Starters: Jackie Brown vs Mike Cuellar | Sixth | 19 out |
| Friday, July 9 |
| » Lost to Tigers (46-38), 1-0 | Robert F. Kennedy Stadium (17-25) | 33-51 | Lost 3 |
| » Starters: Joe Coleman vs Pete Broberg | Sixth | 20 out |
| Saturday, July 10 |
| » Lost to Tigers (47-38), 4-2 | Robert F. Kennedy Stadium (17-26) | 33-52 | Lost 4 |
| » Starters: Mickey Lolich vs Denny McLain | Sixth | 20½ out |
| Sunday, July 11 |
| » Defeated Tigers (47-39), 4-3 | Robert F. Kennedy Stadium (18-26) | 34-52 | |
| » Starters: Dean Chance vs Bill Gogolewski | Sixth | 20½ out |
| Thursday, July 15 |
| » Defeated White Sox (38-48), 8-3 | Robert F. Kennedy Stadium (19-26) | 35-52 | Won 2 |
| » Starters: Wilbur Wood vs Dick Bosman | Sixth | 20½ out |
| Friday, July 16 |
| » Lost to White Sox (39-48), 2-0 | Robert F. Kennedy Stadium (19-27) | 35-53 | |
| » Starters: Tommy John vs Pete Broberg | Sixth | 20½ out |
| Former Senator Earl McNeely dies in Sacramento, CA at the age of 74. |
| Saturday, July 17 |
| » Lost to Twins (42-48), 5-3 | Robert F. Kennedy Stadium (19-28) | 35-54 | Lost 2 |
| » Starters: Jim Kaat vs Jim Shellenback | Sixth | 20½ out |
| Sunday, July 18 |
| » Defeated Twins (42-49), 3-2 | Robert F. Kennedy Stadium (20-28) | 36-54 | |
| » Starters: Steve Luebber vs Bill Gogolewski | Sixth | 20½ out |
| Monday, July 19 |
| » Defeated Twins (42-50), 5-2 | Robert F. Kennedy Stadium (21-28) | 37-54 | Won 2 |
| » Starters: Jim Perry vs Jackie Brown | Sixth | 20½ out |
| Tuesday, July 20 |
| » Defeated Brewers (39-52), 5-1 | Robert F. Kennedy Stadium (22-28) | 38-54 | Won 3 |
| » Starters: Marcelino Lopez vs Dick Bosman | Sixth | 19½ out |
| Wednesday, July 21 |
| » Defeated Brewers (39-53), 6-1 | Robert F. Kennedy Stadium (23-28) | 39-54 | Won 4 |
| » Starters: Marty Pattin vs Pete Broberg | Fifth | 18½ out |
| Thursday, July 22 |
| » Lost to Brewers (40-53), 2-0 | Robert F. Kennedy Stadium (23-29) | 39-55 | |
| » Starters: Skip Lockwood vs Jim Shellenback | Sixth | 19½ out |
| Saturday, July 24 |
| » Lost to White Sox (43-53), 6-5 | Comiskey Park I (0-3) | 39-56 | Lost 2 |
| » Starters: Bill Gogolewski vs Tommy John | Fifth | 20 out |
| » Defeated White Sox (43-54), 5-3 | Comiskey Park I (1-3) | 40-56 | |
| » Starters: Mike Thompson vs Tom Bradley | Fifth | 20 out |
| Sunday, July 25 |
| » Lost to White Sox (44-54), 5-1 | Comiskey Park I (1-4) | 40-57 | |
| » Starters: Dick Bosman vs Wilbur Wood | Sixth | 20 out |
| » Lost to White Sox (45-54), 9-6 | Comiskey Park I (1-5) | 40-58 | Lost 2 |
| » Starters: Jackie Brown vs Joe Horlen | Sixth | 20 out |
| Tuesday, July 27 |
| » Lost to Twins (46-54), 4-2 | Metropolitan Stadium (1-3) | 40-59 | Lost 3 |
| » Starters: Jim Shellenback vs Steve Luebber | Sixth | 21½ out |
| Wednesday, July 28 |
| » Defeated Twins (46-55), 7-1 | Metropolitan Stadium (2-3) | 41-59 | |
| » Starters: Bill Gogolewski vs Jim Perry | Sixth | 21½ out |
| Friday, July 30 |
| » Defeated Brewers (43-59), 3-2 | County Stadium (1-2) | 42-59 | Won 2 |
| » Starters: Dick Bosman vs Marcelino Lopez | Fifth | 21½ out |
| Saturday, July 31 |
| » Defeated Brewers (43-60), 4-3 | County Stadium (2-2) | 43-59 | Won 3 |
| » Starters: Mike Thompson vs Bill Parsons | Fifth | 21½ out |
| Sunday, August 1 |
| » Lost to Brewers (44-60), 4-3 | County Stadium (2-3) | 43-60 | |
| » Starters: Jim Shellenback vs Jim Slaton | Fifth | 22½ out |
| » Lost to Brewers (45-60), 3-2 | County Stadium (2-4) | 43-61 | Lost 2 |
| » Starters: Bill Gogolewski vs Skip Lockwood | Fifth | 22½ out |
| Monday, August 2 |
| » Lost to Tigers (57-49), 11-7 | Tiger Stadium (0-5) | 43-62 | Lost 3 |
| » Starters: Pete Broberg vs Joe Coleman | Fifth | 22½ out |
| Tuesday, August 3 |
| » Defeated Tigers (57-50), 4-2 | Tiger Stadium (1-5) | 44-62 | |
| » Starters: Denny McLain vs Joe Niekro | Fifth | 22 out |
| Wednesday, August 4 |
| » Lost to Tigers (58-50), 2-1 | Tiger Stadium (1-6) | 44-63 | |
| » Starters: Dick Bosman vs Mickey Lolich | Fifth | 23 out |
| Thursday, August 5 |
| » Lost to Indians (44-67), 7-1 | Robert F. Kennedy Stadium (23-30) | 44-64 | Lost 2 |
| » Starters: Vince Colbert vs Mike Thompson | Fifth | 23 out |
| Friday, August 6 |
| » Defeated Indians (44-68), 7-3 | Robert F. Kennedy Stadium (24-30) | 45-64 | |
| » Starters: Steve Hargan vs Bill Gogolewski | Fifth | 22 out |
| Saturday, August 7 |
| » Defeated Indians (44-69), 7-0 | Robert F. Kennedy Stadium (25-30) | 46-64 | Won 2 |
| » Starters: Mike Paul vs Pete Broberg | Fifth | 22 out |
| Sunday, August 8 |
| » Lost to Indians (45-69), 6-2 | Robert F. Kennedy Stadium (25-31) | 46-65 | |
| » Starters: Steve Dunning vs Denny McLain | Fifth | 22 out |
| Tuesday, August 10 |
| » Lost to Royals (57-54), 9-2 | Robert F. Kennedy Stadium (25-32) | 46-66 | Lost 2 |
| » Starters: Al Fitzmorris vs Dick Bosman | Fifth | 23½ out |
| » Lost to Royals (58-54), 3-1 | Robert F. Kennedy Stadium (25-33) | 46-67 | Lost 3 |
| » Starters: Mike Hedlund vs Mike Thompson | Fifth | 23½ out |
| Wednesday, August 11 |
| » Lost to Royals (59-54), 1-0 | Robert F. Kennedy Stadium (25-34) | 46-68 | Lost 4 |
| » Starters: Paul Splittorff vs Bill Gogolewski | Sixth | 24½ out |
| Thursday, August 12 |
| » Lost to Royals (60-54), 2-0 | Robert F. Kennedy Stadium (25-35) | 46-69 | Lost 5 |
| » Starters: Ken Wright vs Jim Shellenback | Sixth | 25 out |
| » Defeated Royals (60-55), 2-1 | Robert F. Kennedy Stadium (26-35) | 47-69 | |
| » Starters: Lance Clemons vs Pete Broberg | Sixth | 25 out |
| » Major-league debuts: Lance Clemons (Royals) |
| Friday, August 13 |
| » Defeated Angels (55-65), 4-0 | Robert F. Kennedy Stadium (27-35) | 48-69 | Won 2 |
| » Starters: Andy Messersmith vs Denny McLain | Fifth | 25 out |
| Saturday, August 14 |
| » Defeated Angels (55-66), 2-0 | Robert F. Kennedy Stadium (28-35) | 49-69 | Won 3 |
| » Starters: Clyde Wright vs Mike Thompson | Fifth | 24 out |
| Sunday, August 15 |
| » Lost to Angels (56-66), 4-3 | Robert F. Kennedy Stadium (28-36) | 49-70 | |
| » Starters: Eddie Fisher vs Dick Bosman | Fifth | 24 out |
| Tuesday, August 17 |
| » Defeated Athletics (78-43), 8-1 | Robert F. Kennedy Stadium (29-36) | 50-70 | |
| » Starters: Blue Moon Odom vs Bill Gogolewski | Fifth | 24½ out |
| Wednesday, August 18 |
| » Defeated Athletics (78-44), 10-3 | Robert F. Kennedy Stadium (30-36) | 51-70 | Won 2 |
| » Starters: Chuck Dobson vs Pete Broberg | Fifth | 24½ out |
| Friday, August 20 |
| » Defeated Royals (63-59), 6-3 | Municipal Stadium (1-2) | 52-70 | Won 3 |
| » Starters: Denny McLain vs Al Fitzmorris | Fifth | 23 out |
| » Defeated Royals (63-60), 8-2 | Municipal Stadium (2-2) | 53-70 | Won 4 |
| » Starters: Dick Bosman vs Ken Wright | Fifth | 23 out |
| Saturday, August 21 |
| » Lost to Royals (64-60), 8-5 | Municipal Stadium (2-3) | 53-71 | |
| » Starters: Mike Thompson vs Mike Hedlund | Fifth | 24 out |
| Sunday, August 22 |
| » Lost to Royals (65-60), 4-1 | Municipal Stadium (2-4) | 53-72 | Lost 2 |
| » Starters: Jackie Brown vs Paul Splittorff | Fifth | 25 out |
| Tuesday, August 24 |
| » Lost to Angels (61-68), 2-1 | Anaheim Stadium (2-2) | 53-73 | Lost 3 |
| » Starters: Pete Broberg vs Clyde Wright | Fifth | 26 out |
| Wednesday, August 25 |
| » Defeated Angels (61-69), 5-4 | Anaheim Stadium (3-2) | 54-73 | |
| » Starters: Denny McLain vs Rudy May | Fifth | 26 out |
| Thursday, August 26 |
| » Defeated Angels (61-70), 8-3 | Anaheim Stadium (4-2) | 55-73 | Won 2 |
| » Starters: Dick Bosman vs Tom Murphy | Fifth | 26 out |
| Friday, August 27 |
| » Lost to Athletics (83-47), 6-2 | Oakland-Alameda County Stadium (0-3) | 55-74 | |
| » Starters: Bill Gogolewski vs Blue Moon Odom | Fifth | 26½ out |
| Saturday, August 28 |
| » Lost to Athletics (84-47), 10-6 | Oakland-Alameda County Stadium (0-4) | 55-75 | Lost 2 |
| » Starters: Mike Thompson vs Chuck Dobson | Fifth | 27 out |
| Sunday, August 29 |
| » Lost to Athletics (85-47), 4-3 | Oakland-Alameda County Stadium (0-5) | 55-76 | Lost 3 |
| » Starters: Pete Broberg vs Vida Blue | Fifth | 28 out |
| » Lost to Athletics (86-47), 9-0 | Oakland-Alameda County Stadium (0-6) | 55-77 | Lost 4 |
| » Starters: Denny McLain vs Catfish Hunter | Fifth | 28 out |
| Tuesday, August 31 |
| » Defeated Yankees (66-68), 6-5 | Yankee Stadium (5-2) | 56-77 | |
| » Starters: Dick Bosman vs Mike Kekich | Fifth | 27 out |
| Wednesday, September 1 |
| » Defeated Yankees (66-69), 2-0 | Yankee Stadium (6-2) | 57-77 | Won 2 |
| » Starters: Bill Gogolewski vs Steve Kline | Fifth | 27 out |
| Thursday, September 2 |
| » Lost to Yankees (67-69), 11-1 | Yankee Stadium (6-3) | 57-78 | |
| » Starters: Jim Shellenback vs Stan Bahnsen | Fifth | 27 out |
| Friday, September 3 |
| » Lost to Orioles (83-49), 4-2 | Robert F. Kennedy Stadium (30-37) | 57-79 | Lost 2 |
| » Starters: Dave McNally vs Pete Broberg | Fifth | 28 out |
| Saturday, September 4 |
| » Lost to Orioles (84-49), 6-2 | Robert F. Kennedy Stadium (30-38) | 57-80 | Lost 3 |
| » Starters: Jim Palmer vs Denny McLain | Fifth | 29 out |
| Sunday, September 5 |
| » Defeated Orioles (84-50), 5-3 | Robert F. Kennedy Stadium (31-38) | 58-80 | |
| » Starters: Mike Cuellar vs Dick Bosman | Fifth | 28 out |
| Monday, September 6 |
| » Lost to Tigers (77-62), 3-0 | Robert F. Kennedy Stadium (31-39) | 58-81 | |
| » Starters: Mickey Lolich vs Bill Gogolewski | Fifth | 28½ out |
| Tuesday, September 7 |
| » Lost to Tigers (78-62), 3-2 | Robert F. Kennedy Stadium (31-40) | 58-82 | Lost 2 |
| » Starters: Joe Coleman vs Mike Thompson | Fifth | 29½ out |
| Wednesday, September 8 |
| » Lost to Tigers (79-62), 5-3 | Robert F. Kennedy Stadium (31-41) | 58-83 | Lost 3 |
| » Starters: Mike Kilkenny vs Pete Broberg | Fifth | 30 out |
| Thursday, September 9 |
| » Lost to Orioles (87-51), 4-2 | Memorial Stadium (1-5) | 58-84 | Lost 4 |
| » Starters: Denny McLain vs Jim Palmer | Fifth | 31 out |
| Friday, September 10 |
| » Lost to Orioles (88-51), 7-1 | Memorial Stadium (1-6) | 58-85 | Lost 5 |
| » Starters: Dick Bosman vs Mike Cuellar | Fifth | 32 out |
| Tuesday, September 14 |
| » Lost to Indians (57-88), 3-1 | Cleveland Stadium (6-2) | 58-86 | Lost 6 |
| » Starters: Bill Gogolewski vs Vince Colbert | Fifth | 32 out |
| » Game at Robert F. Kennedy Stadium interrupted in the 17th inning with the score of Senators 5, Indians 5. Completed on September 20. |
| Wednesday, September 15 |
| » Lost to Tigers (84-65), 4-2 | Tiger Stadium (1-7) | 58-87 | Lost 7 |
| » Starters: Denny McLain vs Joe Coleman | Fifth | 32 out |
| Former Senator Roberto Ortiz dies in Miami, FL at the age of 57. |
| Thursday, September 16 |
| » Lost to Tigers (85-65), 3-1 | Tiger Stadium (1-8) | 58-88 | Lost 8 |
| » Starters: Dick Bosman vs Les Cain | Fifth | 33 out |
| Friday, September 17 |
| » Lost to Red Sox (79-73), 10-7 | Robert F. Kennedy Stadium (31-42) | 58-89 | Lost 9 |
| » Starters: Ray Culp vs Mike Thompson | Fifth | 32½ out |
| Saturday, September 18 |
| » Defeated Red Sox (79-74), 6-1 | Robert F. Kennedy Stadium (32-42) | 59-89 | |
| » Starters: Ken Brett vs Bill Gogolewski | Fifth | 31½ out |
| Sunday, September 19 |
| » Lost to Red Sox (80-74), 4-3 | Robert F. Kennedy Stadium (32-43) | 59-90 | |
| » Starters: Roger Moret vs Pete Broberg | Fifth | 32½ out |
| Monday, September 20 |
| » Lost to Indians (58-94), 3-1 | Robert F. Kennedy Stadium (32-44) | 59-91 | Lost 2 |
| » Starters: Alan Foster vs Denny McLain | Fifth | 33 out |
| » Defeated Indians (58-95), 8-6 | Cleveland Stadium (7-2) | 60-91 | |
| » Starters: Pete Broberg vs Steve Dunning | Fifth | 33 out |
| Tuesday, September 21 |
| » Defeated Indians (58-96), 9-1 | Robert F. Kennedy Stadium (33-44) | 61-91 | Won 2 |
| » Starters: Rich Hand vs Dick Bosman | Fifth | 33 out |
| Wednesday, September 22 |
| » Defeated Indians (58-97), 3-2 | Robert F. Kennedy Stadium (34-44) | 62-91 | Won 3 |
| » Starters: Vince Colbert vs Bill Gogolewski | Fifth | 33 out |
| Friday, September 24 |
| » Lost to Red Sox (83-74), 4-0 | Fenway Park (2-5) | 62-92 | |
| » Starters: Pete Broberg vs Roger Moret | Fifth | 34½ out |
| Saturday, September 25 |
| » Lost to Red Sox (84-74), 6-3 | Fenway Park (2-6) | 62-93 | Lost 2 |
| » Starters: Denny McLain vs John Curtis | Fifth | 35½ out |
| Sunday, September 26 |
| » Lost to Red Sox (85-74), 8-1 | Fenway Park (2-7) | 62-94 | Lost 3 |
| » Starters: Dick Bosman vs Jim Lonborg | Fifth | 36½ out |
| » Major-league debuts: Bill Fahey (Senators) |
| Tuesday, September 28 |
| » Defeated Yankees (80-80), 4-2 | Robert F. Kennedy Stadium (35-44) | 63-94 | |
| » Starters: Stan Bahnsen vs Bill Gogolewski | Fifth | 37 out |
| Wednesday, September 29 |
| » Lost to Yankees (81-80), 6-3 | Robert F. Kennedy Stadium (35-45) | 63-95 | |
| » Starters: Mel Stottlemyre vs Jim Shellenback | Fifth | 38 out |
| Thursday, September 30 |
| » Senators forfeited to Yankees. | Robert F. Kennedy Stadium (35-46) | 63-96 | Lost 2 |
| » Starters: Mike Kekich vs Dick Bosman | Fifth | 37½ out |
| Friday, October 8 |
| Former Senator Murray Wall dies in Lone Oak, TX at the age of 46. |
| Thursday, October 14 |
| Former Senator Doc Prothro dies in Memphis, TN at the age of 79. |
Game information provided by Retrosheet (www.retrosheet.org) |