Justin Masterson

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Position	Pitcher
Born	22 Mar 1985 (41 years)
Nationality	United States

Justin Masterson is an American pitcher on the Boston Red Sox.

Masterson was drafted by Boston in 2006, and made his first start in April of 2008, filling in for the injured Daisuke Matsuzaka. Red Sox management has indicated that he will begin to transition to a relief pitcher.