Carpenter, 26, began the 2012 season on the 60-day disabled list recovering from right elbow surgery and was activated and optioned to Triple-A Pawtucket on July 31. In 16 relief appearances overall for the PawSox this season, including seven on rehab, he has gone 1-0 with four saves and 1.15 ERA (2 ER/15.2 IP) while holding opponents to a .137 average (7-for-51) and compiling 17 strikeouts. The right-hander also appeared in two rehab games each with the Rookie Gulf Coast League Red Sox and Single-A Greenville, and one with Double-A Portland. Acquired by the Red Sox from the Cubs in February, Carpenter made his Major League debut with Chicago in 2011 and posted a 2.79 ERA (3 ER/9.2 IP) over his 10 games, all out of the bullpen. Selected by the Cubs in the third round of the 2008 First-Year Player Draft, Carpenter owns a 22-19 record, six saves, a 3.52 ERA (142 ER/362.2 IP) and 314 strikeouts in 117 career minor league games (64 starts) in the Cubs (2008-11) and Red Sox (2012) systems.