Duncan: Perez needs to improve slider

The St. Louis Post-Dispatch's Bernie Miklasz reports St. Louis Cardinals pitching coach Dave Duncan said RP Chris Perez has to refine his slider and make it more consistent. He said Perez throws a good slider sometimes, but he needs to throw a good slider all the time. Duncan said hitters are happy when Perez throws his slider because it's nowhere near as good as his fastball. Duncan said it's no guarantee Perez will begin the season in the majors. He also praised Perez's work ethic and will to improve.

(kffl.com)