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In franchise history, that is closer Dan Plesac with 365 games pitched. He played with the team between 1986-1992. Plesac's 133 saves with the Brewers is also a franchise record.
There have been two pitchers that pitched games in MORE than 25 seasons ... Nolan Ryan in 27 and Tommy John in 26. Two other pitchers have pitched in 25 seasons ... Jim Kaat and Charlie Hough. If Jamie Moyer makes the Colorado Rockies squad and pitches in a game in 2012, he will have pitched in 25 seasons.
In MLB, a player is considered a rookie if they start a season with A) no more than 130 at bats in major league games (for non-pitchers), or B) no more than 50 innings pitched in major league games (for pitchers), or C) no more than 45 days on the active roster of a team(s) between the beginning of a season and August 31 (for pitchers and non-pitchers).
Through the 2008 season, that is Ken Sanders of the 1971 Brewers who pitched in 83 games. He led the American League in saves that year with 31.
In 1998, Billy Brewer pitched in 2 games for the Philadelphia Phillies, with an ERA of 108. He started 0 games and finished 0, pitching no complete games. He threw no shutouts and recorded no saves, ending up with 0 wins and 1 loss. He pitched a total of 1 out, facing 6 batters. He gave up 3 hits and 4 earned runs, but no home runs. He struck out 0 batters and walked 2.
In 2013, Charles Brewer pitched in 4 games for the Arizona Diamondbacks, with an ERA of 3. He started 0 games and finished 2, pitching no complete games. He threw no shutouts and recorded no saves, ending up with 0 wins and 0 losses. He pitched a total of 18 outs, facing 27 batters. He gave up 8 hits and 2 earned runs, but no home runs. He struck out 5 batters and walked 2.
Tom Gordon pitched in 159 games for the Yankees in the 2004 and 2005 seasons. He was used primarily as a setup man for Mariano Rivera.
In 1995, Billy Brewer pitched in 48 games for the Kansas City Royals, with an ERA of 5.56. He started 0 games and finished 13, pitching no complete games. He threw no shutouts and recorded no saves, ending up with 2 wins and 4 losses. He pitched a total of 136 outs, facing 209 batters. He gave up 54 hits and 28 earned runs, including 9 home runs. He struck out 31 batters and walked 20.
In 1974, Jim Brewer pitched in 24 games for the Los Angeles Dodgers, with an ERA of 2.52. He started 0 games and finished 18, pitching no complete games. He threw no shutouts and recorded no saves, ending up with 4 wins and 4 losses. He pitched a total of 118 outs, facing 156 batters. He gave up 29 hits and 11 earned runs, including 5 home runs. He struck out 26 batters and walked 10.
In 1976, Jim Brewer pitched in 13 games for the California Angels, with an ERA of 2.7. He started 0 games and finished 7, pitching no complete games. He threw no shutouts and recorded 2 saves, ending up with 3 wins and 1 loss. He pitched a total of 60 outs, facing 85 batters. He gave up 20 hits and 6 earned runs, but no home runs. He struck out 16 batters and walked 6.
In 1993, Billy Brewer pitched in 46 games for the Kansas City Royals, with an ERA of 3.46. He started 0 games and finished 14, pitching no complete games. He threw no shutouts and recorded no saves, ending up with 2 wins and 2 losses. He pitched a total of 117 outs, facing 157 batters. He gave up 31 hits and 15 earned runs, including 6 home runs. He struck out 28 batters and walked 20.