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Ya, but his periphs are a LOT better than Felix. He leads in WAR even with the IPs gap. Its not a huge gap. Liriano has pitched less innings, but been much more dominant non-ERA wise.
Cliff Lee has actually been better too and is in between the two IPs wise. If he finishes strong I could see an argument for him too.
I think its between those three (at least for me) and the last few starts could end up deciding it. I can't really see an argument for anyone else since those three have been so far ahead of the pack this season.