When the Pirates acquired Joel Hanrahan from the Nationals, I immediately noticed the huge discrepancy between his peripherals and his unsightly 7.71 ERA. Hanrahan struck out 35 batters, walked 14, and allowed three home runs in his 32.2 inning with Washington this year. That comes out to a FIP of 3.60, more than four runs lower than his actual ERA. I immediately liked the acquisition, as it seemed obvious that Hanrahan's absurd .451 opponent's BABIP was dramatically damaging his numbers. Superficial improvement seemed imminent, regardless of any authentic progress being present.
Fast forward to today, August 28. Hanrahan has thrown 19.2 innings for the Pirates, with an impressive 25 strikeouts, a less impressive 11 walks, and zero home runs allowed. His FIP with Pittsburgh is 2.37, and h...

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