Matt Thornton working on his slider

Cowley:

… As if Thornton’s deceptive 95 mph-plus fastball wasn’t headache enough, the southpaw has been spending camp fine-tuning a slider he has tinkered with in the past but never perfected.

If he can carry what he’s been doing in Cactus League play over to the regular season, then the Sox have not just an elite setup man, but a closer-in-waiting if Bobby Jenks is injured or not performing this year or in 2011. …

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