LHP Sean O'Sullivan, who had been out since July 9 due to left knee tendinitis, was activated from the disabled list and outrighted to Triple-A Pawtucket on Thursday. O'Sullivan was 2-0 with a 6.75 ERA in five games (four starts) for Boston this year. In 14 starts for Pawtucket, he is 6-5 with a 4.23 ERA.

LHP Sean O'Sullivan (left knee tendinitis) began a rehab assignment with Triple-A Pawtucket on Thursday. He gave up six runs on six hits in three innings.

LHP Sean O'Sullivan (left knee tendinitis) was placed on the 15-day disabled list Saturday. "Something he's been battling for some time, and he needs some downtime to recover from this," Red Sox manager John Farrell said. O'Sullivan is 2-0 with a 6.75 ERA in five games (four starts) with Boston this season.

RHP Sean O'Sullivan, making his second start since returning from Pawtucket, allowed four runs on seven hits and didn't get a decision on Friday night -- twice failing to hold two-run leads. "It wasn't great," he said of his outing. "It started out pretty good...I was pretty disappointed with tonight's outing. But our relievers stepped up huge and our offense pulled it through." The Red Sox are 4-0 in his four starts.

RHP Sean O'Sullivan, who turned in a solid outing in what was slated to be a spot start up from Pawtucket last Sunday, opens the Red Sox three-game series against the Tampa Bay Rays at Fenway Park on Friday night. O'Sullivan, making his fourth big league start of the season, went five-plus innings and allowed two runs, both scoring after he left Sunday. The Red Sox have won all three of his starts and his 2-0 mark this season raised his career record to 13-23.

RHP Sean O'Sullivan, who pitched well in his spot start Sunday, will start Friday's game against the Tampa Bay Rays, with floundering RHP Clay Buchholz being shipped back to the bullpen for the second time this season.

RHP Sean O'Sullivan gave the Red Sox a much needed strong start Sunday, departing to a standing ovation two batters into the sixth inning after throwing five scoreless frames. "That was one of the highlights of my career for sure," O'Sullivan said of the ovation. All told, O'Sullivan (2-0) was charged with three runs, and gave up four hits and three walks with two strikeouts.

RHP Sean O'Sullivan, one of nine starters used by the Red Sox this season, is coming up from Pawtucket to pitch Sunday's series finale against the Los Angeles Angels. O'Sullivan, 1-0 with a 7.94 ERA in three games, two starts, with the Red Sox earlier this season, got the nod over former Independent League pitcher Aaron Wilkerson, who is 4-1 with a 2.20 ERA at Pawtucket. O'Sullivan is a former Angel.

RHP Sean O'Sullivan, 1-0 with a 7.94 ERA in three games, two starts, with the Red Sox earlier this season, will come up from Triple-A Pawtucket to pitch the series finale against the Angels on Sunday. Next Thursday's off day will permit the Red Sox to need a fifth starter just this once before the All-Star break. O'Sullivan is 6-2 with a 2.67 ERA at Pawtucket.

RHP Sean O'Sullivan will be recalled from Pawtucket to start Sunday's series finale against the Angels.

RHP Sean O'Sullivan, who was designated for assignment Monday, cleared waivers and was outrighted to Triple-A Pawtucket. O'Sullivan was 1-0 but with a 7.94 ERA in three games, including two starts, allowing 19 hits, including two home runs, in 11 1/3 innings. O'Sullivan, 28, has also pitched in the majors with the Angels, Royals, Padres and Phillies.

RHP Sean O'Sullivan got an ovation from the fans Fenway Park while departing Sunday's start, his second in a row in which Boston emerged from with a victory. His reward? O'Sullivan was designated for assignment after the game, with a corresponding roster move coming Monday. "I didn't know (before the game), but I had a pretty good idea," O'Sullivan said of the move. "I had more fun playing these last two weeks in this clubhouse than anywhere else in the big leagues." O'Sullivan lasted 4 1/3 innings Sunday, giving up six runs (five earned) on five hits and two walks while striking out three in a no-decision. He won his only other start with the Red Sox on Tuesday against Oakland despite giving up four runs and 12 hits in six innings. O'Sullivan last won consecutive starts from Sept. 23-28, 2010, as a member of the Royals. He is 1-0 with a 7.94 ERA over three appearances in 2016.

RHP Sean O'Sullivan makes his second start in a Red Sox uniform in Sunday's series finale against Houston. He allowed four runs on 12 hits and struck out three Tuesday against Oakland, and gave up five runs on three home runs, seven hits and two walks while striking out four in six innings on Aug. 7, 2014 with Philadelphia -- his only start against the Astros. O'Sullivan is 12-23 with a 5.96 ERA, a 1.59 WHIP and 149 K's over 309 1/3 innings in 68 career games (53 starts).

RHP Sean O'Sullivan didn't need to pitch well to get the win in his first start with the Red Sox on Tuesday, but he did anyway. O'Sullivan lasted six innings, giving up four runs, all in the sixth after the Red Sox built an 11-0 lead. He allowed 12 hits, walked none and struck out three."I think it was mostly fastball-cutter combo," O'Sullivan said. "Just tried to move to both sides of the plate. I hadn't seen a lot of these guys, so I let (catcher Ryan Hanigan) take the lead on most of that. I thought he did a great job back there."

RHP Sean O'Sullivan starts for the Red Sox in Tuesday's second game of the three-game series. He is making his first start as a member of the Red Sox and his first in the major leagues since pitching for the Philadelphia Phillies against the Dodgers in Los Angeles last July 6. He is 11-23 with a 5.96 ERA lifetime in the major leagues. He allowed three earned runs or less in each of his five starts at Pawtucket before being called up.

RHP Sean O'Sullivan will likely start Tuesday's game against the Oakland Athletics. The Red Sox have not officially announced a starter for Tuesday but manager John Farrell said "everything points" toward him making the start. O'Sullivan join the Red Sox Friday after his contract was purchased from Triple-A Pawtucket.

RHP Sean O'Sullivan was added to the active roster when his contract was purchased from Triple-A Pawtucket. O'Sullivan is 2-2 with a 3.00 ERA in his five starts for Pawtucket and has held hitters to a .203 average. Manager John Farrell said O'Sullivan is a candidate to start Tuesday's game against Oakland. Farrell said O'Sullivan's arm strength during spring training was greater than the Red Sox anticipated and also added O'Sullivan's cutter is more consistent in terms of location down in the strike zone.

RHP Sean O'Sullivan had his contract purchased by the Red Sox from fromTriple-A Pawtucket on Friday. Boston manager John Farrell said O'Sullivan is a candidate to start Tuesday against Oakland.

O'Sullivan accepted his assignment to Triple-A Lehigh Valley on Wednesday, CSN Philadelphia reports.

O'Sullivan could have opted for free agency, but he will stick with the Phillies as they give him the best shot at seeing time in the majors again this season.

O'Sullivan was outrighted to Triple-A Lehigh Valley after Monday's game, CSN Philadelphia reports.

O'Sullivan was hit hard again in his start Monday against the Dodgers. He allowed seven runs (six earned) on eight hits over 5.1 innings. He had allowed six runs in each of his last three starts. The Phillies will announce a corresponding roster move on Tuesday.