Red Ruffing.
Ruffing holds the Red Sox record for most losses in a season with 25 in 1928. His record that season was 10-25.
The most losses for the Leafs in a season was in the 1984-85 season when they went 20-52-8.
The record for the most home runs hit by a pitcher in a single season is 9, achieved by Wes Ferrell in 1931.
That would be Cy Young, who won 33 and lost 10, in 1901 for the Boston team in the American League, in its first year of operation.
Sandy Koufax with 382 strikeouts in 1965.
Ferguson Jenkins with 25 in 1974.
Through the 2008 season, that is Mordecai 'Three Finger' Brown who won 29 games in the 1908 season.
Through the 2008 season, that is Paul Quantrill who pitched in 86 games in the 2004 season.
As of the 2008 season, that is Ferguson Jenkins who struck out 274 batters in 1970.
The major league pitcher with the highest ERA in a single season who pitched 100 or more innings was Bill Chamberlain. He recorded an ERA of 7.74 in the 1893 season while playing for the St. Louis Browns.
8
Hugh Duffy of the 1894 Boston Beaneaters.
Hugh Duffy of Boston in 1894 with a Batting average of .440.