[kyleb]

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On the other hand, they can only start Wang twice as a potential ace (today's antics not withstanding, Andy is not an ace).

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yeah cuz there is a huge difference (any?) between him and pettite.

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Yes, there's a significant difference between them. Wang's SNLVAR is almost a full point better than Pettitte's. Furthermore, Wang depresses SLG allowed (specifically home runs) at a much better rate. I do not believe that Wang's xFIP accurately predicts his true ERA. The ability to generate consistant groundball outs is very valuable, even if it is in front of a terrible defense.