 In 2003, he played collegiate summer baseball in the Cape Cod Baseball League for the Yarmouth-Dennis Red Sox, where he was named the Eastern division MVP of the league's annual all-star game.He was the first of his UH class to be selected in the 2004 amateur draft, being chosen by Arizona Diamondbacks in the third round.Mock began the 2006 season pitching for the Tennessee Smokies of the Double-A Southern League, where he accrued a 4–8 win–loss record and 4.95 earned run average (ERA) in 23 starts.