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MattSabathia this year made exactly this adjustment which is what allowed him to win the Cy; in previous seasons, he was trying to strike everyone out, but in trying to make those perfect pitches, he ended up walking a lot of batters and it drove his pitch count high and he wasn't able to go deep into games (see his playoff appearances this year for this phenomenon). During the regular season this year, he figured out it was OK to give up contact as long as it wasn't solid contact and getting guys out in 2 pitches is better then getting a 6 pitch strikeout.