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Pettite's key: Better secondary stuff

Andy Pettitte made eight starts prior to getting hurt and posted a respectable 3.83 ERA.

Andy Pettitte Pitches - 2013 Season

He only allowed more than three runs twice.

In eight starts coming off the disabled list, Pettitte's ERA is 4.96 and he's allowed more than three runs in all but one of those starts.

Two pitches have been slow to come back for Pettitte -- his cutter/slider and his changeup.

We've put a side-by-side comparison of Pettite's pitches before the injury with their performance since his return.

The stats to take heed of are those with the two pitch types we mentioned.

When Pettitte is going well, his rate of outs to baserunners with those pitches is in the 4-to-1 range. In his last eight starts, he's getting only about two outs with his cutter/slider for every baserunner, and his ratio with the changeup is almost 1-to-1.

Keep an eye out for the progress of both of those pitches beginning tonight in Boston.