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Jerome Williams began the season as a starting pitcher for the Phillies. After a 4-10 start boasting a disgraceful 6.13 ERA, Pete Mackanin decided to move Williams to the bullpen where he was much more effective. In 12 games as a reliever, his ERA plummeted from 6.13 to 3.52, his WHIP fell from 1.656 to 1.304, and his batting average against dropped from .323 to .268.
There were 141 pitchers in 2015 that completed at least 100 innings.