This was from MLB.com:
Henry, a longtime reliever who ended his career with the Royals in 2001, remembered that Mendoza was deflated when he reported to Omaha in 2010. Even worse, his pitches were flatter than a pancake. The solution was to get Mendoza on the top of the ball and delivering downhill so that his pitches sank.
“He tried it and didn’t like it and went back to his old stuff,” Henry recalled. “And then one day, to his credit, he came in and said, ‘I’m ready. Let’s do this for real.’ That was about midseason in 2010. He made the change and he’s been at it wholeheartedly since and he became the pitcher he is now. He’s given himself a chance to be successful in the big leagues. The ball’s sinking, it’s not flat over the zone anymore. He’s a big horse and he’s got the potential to have some fun up there this year.”
I know I've got him on my team.