Sean O'Sullivan has elected to become a free agent.
Red Sox activated RHP Sean O'Sullivan from the 15-day disabled list; sent him outright to Triple-A Pawtucket.
Red Sox placed RHP Sean O'Sullivan on the 15-day disabled list with left knee tendinitis.
Sean O'Sullivan was charged with four runs in five innings in a no-decision against the Rays on Friday, giving up seven hits and a walk while whiffing four.
Sean O'Sullivan will start Friday against the Rays.
Sean O'Sullivan pitched a serviceable game in Sunday's win over the Angels, allowing two runs on four hits over five-plus innings.
Red Sox recalled RHP Sean O'Sullivan from Triple-A Pawtucket.
Sean O'Sullivan will start on Sunday against the Angels.
Sean O'Sullivan was scratched from his scheduled start Thursday for Triple-A Pawtucket.
Red Sox sent RHP Sean O'Sullivan outright to Triple-A Pawtucket.
Sean O'Sullivan was not long for Sunday's start against the Astros, surrendering six runs (five earned) on five hits over 4 1/3 innings.
Red Sox designated RHP Sean O'Sullivan for assignment.
Sean O'Sullivan will start against the Astros on Sunday.
Sean O'Sullivan was good enough to pick up a win Tuesday, yielding four runs over six frames in a 13-5 victory over the Red Sox.