Veteran hurler returns to bolster Bucs' pitching staff...LAST SEASON:  Posted 1-2 mark in eight appearances (six starts) with 5.68 ERA...Held opponents to .234 batting average...PERSONAL:  Matthew David O'Brien was born on December 5, 1987 in Salem, Mass. ...Son of John and Kimberly O'Brien...Has two younger siblings, Sean (14) and Cameron (6)...Two-sport letterwinner at Swampscott High, where he also played football...Captained baseball squad as a senior...Lists favorites as steak (food), Bad Boys II (movie) and the Red Sox (sports team).