Mastroianni was born in Mount Kisco, New York and attended Fox Lane High School in Bedford, New York and then Winthrop University and University of Southern Indiana. He was drafted by the Toronto Blue Jays in the 16th round of the 2007 MLB amateur draft.\n', '

He played for the Auburn Doubledays in 2007, hitting .287 with three home runs, 26 RBI and 20 stolen bases in 68 games. In 2008, he hit .228 with three home runs, 25 RBI and 30 stolen bases for the Lansing Lugnuts. He split 2009 between the Dunedin Blue Jays and New Hampshire Fisher Cats, hitting a combined .297 with 70 stolen bases in 131 games. He played for the Fisher Cats again in 2010, hitting .301 with 46 stolen bases.\n', '

Mastroianni was called up to replace the newly acquired Kelly Johnson, who had to return to Arizona because he forgot his passport. He debuted for the Blue Jays on August 24, 2011, in center field. Mastroianni finished his debut 0-for-2 with a strikeout. He was designated for assignment before the 2012 season began.\n', '

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