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.
Sean O'Sullivan was saddled with a loss in Saturday's game against the Pirates, yielding four runs on eight hits over his six innings of work.
Sean O'Sullivan took a no-decision but notched a quality start, allowing three runs in six innings, helping the Phillies overcome the Giants on Sunday.
Sean O'Sullivan took a no-decision, giving up four runs in 5 2/3 innings to the Reds as the Phillies walked off winners on Tuesday.
Sean O'Sullivan was demolished by the Mets on Wednesday, allowing seven runs in 5 2/3 innings en route to a loss.
Sean O'Sullivan delivered a quality start in Friday's loss to the Nationals, surrendering just two runs on five hits over his six innings of work.
Sean O'Sullivan got the win after tossing six shutout innings, helping the Phillies defeat the Diamondbacks by a 6-0 score on Sunday.
Sean O'Sullivan gave up three runs in five innings, taking his second loss of the season on Tuesday against the Pirates.
Sean O'Sullivan (knee) will begin a rehab assignment with Low-A Lakewood on Thursday.
Phillies placed RHP Sean O'Sullivan on the 15-day disabled list, retroactive to April 18, with left knee tendinitis.