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It's not really fair to say that he played 134 games last year and say it's almost as many as he played this year and he started to fade way before game 134. Looking at his innings fielded, he had about 930 last year, compared to 1260 this year. Divide the difference by 9 inning games and you get, roughly, 36 games. 36 games ago was August 14 by my count. Franklin Gutierrez from July 16-August 14: .286/.333/.459/.793, and since August 15: .240/.297/.315. This isn't to say that Gutierrez is in line for that 130 OPS+, just saying that fatigue may be playing a bigger part than you're giving it credit for.