Liriano at best comes in as the 5th or 6th left hander period I can think of in the AL, and he isn't near any of them:
Sabathia, Price, Lester, Lee, etc.
Unless you actually look at statistical analysis. Then he's #2 or #3.
EDIT: After looking at it closer, his season probably is #5, but he is clearly in the same ballpark as the 4 you listed.
Here are the stats, if you care:
Name ERA+ WHIP SO/BB PitchW WPA WPA/LI
Liriano 122 1.263 3.35 1.6 2.0 2.6
Price 142 1.256 2.25 2.1 2.1 1.6
Sabathia 132 1.22 2.48 2.1 3.0 2.6
Lester 134 1.184 2.86 2.0 2.7 2.7
Lee 128 0.996 13.00 2.1 2.7 3.6
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