Robertson was drafted in the 31st round of the 2004 MLB draft by the Oakland Athletics out of Birmingham–Southern College.[1] He spent four years working his way up the Oakland minor league system before making his major league debut on May 17 in which he pitched an inning and two thirds in an Oakland 4–7 loss to the Royals;Robertson made two more appearances in the 2007 season and was optioned back to AAA where he pitched as the closer before breaking his thumb and missing the rest of the 2007 season. On December 14,2007,Robertson was traded with starting pitcher Dan Haren to the Arizona Diamondbacks for left-handed pitchers Brett Anderson,Dana Eveland and Greg Smith,infielder Chris Carter and outfielders Aaron Cunningham and Carlos Gonzalez.[2]
In the 2008 season Robertson would make six appearances for the Diamondbacks before being traded in the off season to the New York Mets for Scott Schoeneweis. he would spend the entire 2009 season in the minor leagues and the Mets released him at the conclusion of the 2009 season.[3] Robertson pitched for the Southern Maryland Blue Crabs in the 2010 season in their rotation and in the bullpen;he has not pitched professionally since the conclusion of the Blue Crabs 2010 season.
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