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.
Red Sox manager John Farrell indicated that Sean O'Sullivan is still expected to start on Tuesday.
Sean O'Sullivan is available to start Tuesday against the Athletics.
Red Sox purchased the contract of RHP Sean O'Sullivan from Triple-A Pawtucket.
Red Sox re-assigned RHP Sean O'Sullivan to minor league camp.
Red Sox signed RHP Sean O'Sullivan to a minor league contract.
Phillies sent RHP Sean O'Sullivan outright to Triple-A Lehigh Valley.
Sean O'Sullivan threw a career-high 123 pitches in 5 1/3 innings, yielding seven runs (six earned) but got a no-decision as the Phillies lost to the Dodgers on Monday.
Sean O'Sullivan didn't have anything working in a loss to the Brewers on Monday, surrendering six runs on 12 hits in five innings.
Sean O'Sullivan was knocked around Tuesday, allowing 10 hits and six runs over 4 1/3 innings against the Yankees.
Sean O'Sullivan was effective over his five innings on the mound during Wednesday's win over the Orioles, allowing just one run while striking out seven.