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Felix' lack of sky-high K's sort of annoys me, but I've got to admit that Efficiency is a huge part of his game.
The man threw 500 innings in 2009-10 without breaking a sweat, which is why he's 55-60 runs above replacement. Volume counts, too.
That 7th and 8th inning shtick -- those are high-leverage innings. Felix is his own setup reliever. Huge.