Catcher Brayan Pena, who was Greinke's KC teammate for two years, learned how badly the pitcher wants to win -- on the field and in the clubhouse.
"He liked to compete," Pena said. "We played chess together, we played poker, whatever we were playing, he wanted to win. He learned how to play Spanish dominoes, too. He said we're very passionate about the dominoes, so he wanted to learn how to play. He was very good, too -- [Jose] Guillen taught him how to play."
Pena was a backup catcher in 2009 when Greinke won the American League Cy Young Award.
"Greinke was something special," Pena said. "He taught me a lot of stuff. It was a learning experience with Zack every time that I caught him. The fact that he trusted me to call games -- especially the year that he won the Cy Young. I had a chance to catch him a little bit -- [Miguel] Olivo caught him a lot -- and he was very smart. If he makes a mistake, you'll rarely see him make the same mistake twice. He studies the game from top to bottom and goes about his business very quietly."