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Philly perfect fit for Oswalt's slider

Roy Oswalt is throwing his slider more than ever this season – 17.1 percent of all pitches, compared to 16.5 percent in 2009 and 12.5 percent in 2008.

But his increased reliance on the slider has not been all positive. In fact, hitters this season are hitting it well above the league average.

Oswalt's sliders in 2010 season

The increasing percentage of sliders in Roy Oswalt's pitch selection has not translated into success. In fact, quite the opposite.

It may not be all bad news for Oswalt, however. NL East teams (excluding Philadelphia) are slugging .322 against sliders, by far the lowest in the Major Leagues.