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Biggest Disappointments of 2012

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Left-handed pitcher -- Jon Lester

Photograph By Mark L. Baer/US Presswire

When the Red Sox needed him most this season, Lester failed to deliver. The left-hander who won 16 games in '08, 15 in '09, 19 in '10 and 15 last season had just one win in April and none in July.