Cardinals starter Michael Wacha has added two pitches to his repertoire to help keep opposing batters guessing this season. 

Wacha has been throwing a curveball with more frequency this year. Manager Mike Matheny calls the pitch "nasty", per MLB.com. He also has a cutter that he's throwing more often than his changeup.

"It keeps something in the back of their head that I might be throwing it," Wacha said of the cutter. "I've got confidence in every pitch, and I've had confidence in them. It's just about being able to throw them for strikes and then expanding the zone with those pitches as well. I'm just trying to keep them off balance."