Petrick made his major league debut on June 27, 2007 for the Chicago Cubs, against the Colorado Rockies giving up two earned runs in two innings.\n', '

On February 13, 2009, Petrick signed with the ThunderBolts for their 2009 season. Petrick appeared in 11 games on the season while recovering from an injury. He went 1-0 with a 2.13 ERA in 12.2 innings, racking up three saves and 15 strikeouts while walking only three.\n', '

On April 21, 2010, the Joliet Jack Hammers acquired Petrick, from the ThunderBolts.\n', '

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