Audio: Mathes, O'Malley talk Missions

J.R. Mathes and Ryan O'Malley make up a Triple-A starting rotation that consists of four left-handers.

Ryan O'Malley is back at Triple-A Iowa this season following his unscripted major league debut at Houston last August in an eight-inning performance that led to a 1-0 Cubs shutout victory.

(4:20) | mp3 format

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For his part, J.R. Mathes is in his first go-round at Triple-A, having advanced a level each year since being selected in the 16th round of the 2004 draft.

(5:27) | mp3 format

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