More importantly , with the help of pitching coach Harvey Haddix , he worked on improving his delivery to home plate .
More importantly , with the help of pitching coach Harvey Haddix , he also added the curveball , slider and changeup to his repertoire .
More importantly , with the help of pitching coach Harvey Haddix , he worked on improving his delivery to home plate and also added the curveball , slider and changeup to his repertoire .