Thomas had three seasons as the primary catcher of the Red Sox, helping them to pennants
in 1915-16. He averaged 22 RBI a year as a regular, just over 200 at-bats a season.
He led AL catchers in fielding in 1917. After the season, he went to the Athletics
with two others and cash in the deal that brought Joe Bush
, Wally Schang, and Amos
Strunk to the Red Sox; Thomas was sold to the Indians and played on another pennant
winner in 1920. From 1913 to 1918 he hit .417 as a pinch hitter (13-for-31), but
he failed to get a hit in 16 subsequent pinch at-bats.