Petrick began the 2013 season with the Peoria Chiefs of the Class AMidwest League, and received midseason promotions to the Palm Beach Cardinals of the Class A-AdvancedFlorida State League and Springfield Cardinals of the Class AATexas League.[4] For the season, he combined a 7–3 record (W–L) with a 1.99 earned run average (ERA) and eight saves covering 34 appearances and 13 starts between Peoria, Palm Beach, and Springfield. Pitching at first in relief, his ERA at Peoria was 0.83 and Palm Beach 0.27. At Springfield, he assumed a starting role. In December, the Cardinals named Petrick their 2013 Minor League Pitcher of the Year. "[At Springfield], after nine starts, he established himself for the season as our Minor League Pitcher of the year for 2013", commented Gary LaRocque, the Cardinals' farm director.[5]