Al Mattern played in 5 games at pitcher for the Boston Doves in 1908, starting in none of them. He made one putout, had 8 assists, and committed no errors, equivalent to 0 errors per game (estimate based on total games played in). He had no double plays.
Al Mattern played in 2 games at pitcher for the Boston Braves in 1912, starting in none of them. He made no putouts, had 2 assists, and committed no errors, equivalent to 0 errors per game (estimate based on total games played in). He had no double plays.
Al Mattern played in 47 games at pitcher for the Boston Doves in 1909, starting in none of them. He made 21 putouts, had 100 assists, and committed 10 errors, equivalent to .213 errors per game (estimate based on total games played in). He had 2 double plays.
Al Mattern played in 51 games at pitcher for the Boston Doves in 1910, starting in none of them. He made 12 putouts, had 90 assists, and committed 3 errors, equivalent to .059 errors per game (estimate based on total games played in). He had one double play.
Billy Burke played in 2 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made no putouts, had no assists, and committed one error, equivalent to .5 errors per game (estimate based on total games played in). He had no double plays.
Cecil Ferguson played in 6 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made no putouts, had 8 assists, and committed 2 errors, equivalent to .333 errors per game (estimate based on total games played in). He had no double plays.
Patsy Flaherty played in 4 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made no putouts, had 4 assists, and committed 2 errors, equivalent to .5 errors per game (estimate based on total games played in). He had no double plays.
Sam Frock played in 4 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made one putout, had 4 assists, and committed no errors, equivalent to 0 errors per game (estimate based on total games played in). He had no double plays.
Jiggs Parson played in 7 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made no putouts, had 5 assists, and committed one error, equivalent to .143 errors per game (estimate based on total games played in). He had no double plays.
Fuller Thompson played in 3 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made no putouts, had 2 assists, and committed no errors, equivalent to 0 errors per game (estimate based on total games played in). He had one double play.
Buster Brown played in 42 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made 8 putouts, had 67 assists, and committed 6 errors, equivalent to .143 errors per game (estimate based on total games played in). He had 6 double plays.
Cliff Curtis played in 12 games at pitcher for the Boston Rustlers in 1911, starting in none of them. He made 6 putouts, had 23 assists, and committed 3 errors, equivalent to .25 errors per game (estimate based on total games played in). He had 2 double plays.