Player Page

Sean O'Sullivan | Starting Pitcher

Team: Boston Red Sox
Age / DOB:  (28) / 9/1/1987
Ht / Wt:  6'1" / 245
Bats / Throws: Right / Right
Contract: view contract details

Latest News

Recent News

Red Sox re-assigned RHP Sean O'Sullivan to minor league camp.
With his departure, the Red Sox are down to 45 players in major league camp. The 28-year-old hurler will provide rotation insurance for the Red Sox at Triple-A Pawtucket. Mar 19 - 9:56 AM

Highest Searched Players over the last 7 days

Player News


Red Sox signed RHP Sean O'Sullivan to a minor league contract.

The 28-year-old made 13 dreadful starts for the Phillies in 2015, compiling a 6.08 ERA, 1.61 WHIP and 35/20 K/BB ratio over 71 frames. He's nothing more than organizational rotation depth for the Red Sox.
Fri, Dec 11, 2015 11:21:00 PM

Phillies sent RHP Sean O'Sullivan outright to Triple-A Lehigh Valley.

O'Sullivan got the boot after he threw 123 pitches in 5 1/3 innings while allowing seven runs (six earned) Monday against the Dodgers. The 27-year-old has posted an ugly 6.08 ERA across 13 starts this season. Only Rick Porcello, Kyle Lohse, and Jerome Williams have a higher ERA among pitchers with at least 70 innings pitched. It's unclear who will replace him in Philadelphia's starting rotation.
Tue, Jul 7, 2015 08:32:00 AM

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.

The Phillies backed him up with plenty of run support, but it went for naught. Yasmani Grandal struck the big blow, swatting a three-run home run to tie the game at 6-6 in the fifth inning. Overall, he relented eight hits and a pair of walks while striking out three. O'Sullivan has an unsightly 6.08 ERA with a 1.61 WHIP and a 35/20 K/BB ratio over 71 innings. He'll close out the first half with a start in San Francisco against the Giants.
Tue, Jul 7, 2015 02:39:00 AM

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.

O'Sullivan limited the Brewers to only three runs through five innings, but things fell apart in the sixth inning when he allowed four straight hits before departing. Justin De Fratus came in and allowed two more hits before plugging the leaky ship. Along with the 12 hits, O'Sullivan walked one and struck out three. His ERA moves up to 5.76 with a 1.58 WHIP and a 33/18 K/BB ratio in 66 2/3 innings.
Mon, Jun 29, 2015 10:54:00 PM

Sean O'Sullivan was knocked around Tuesday, allowing 10 hits and six runs over 4 1/3 innings against the Yankees.

O'Sullivan gave up four home runs on the night, serving up jacks to Brett Gardner, Chase Headley, Alex Rodriguez and Garrett Jones. He didn't take the loss -- CC Sabathia wasn't much better on the other side -- but the no-decision left him still without a win since May 17. The right-hander will carry a 5.34 ERA and 1.50 WHIP into Monday's contest with the Nationals.
Wed, Jun 24, 2015 12:16:00 AM

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.

The only run to score against O'Sullivan came at the very start of the contest, when Manny Machado launched a solo home run off the right-hander. With the strong (if relatively short) effort, O'Sullivan dropped his ERA from 5.08 to 4.79. That might look better aesthetically, but his season on the whole doesn't impress. In addition to that ERA mark, O'Sullivan also holds a bloated 1.44 WHIP and a hum-drum 27/14 K/BB ratio over 56 1/3 innings. He'll take to the Bronx for a showdown with the Yankees in his next scheduled start.
Thu, Jun 18, 2015 03:42:00 PM

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.

O'Sullivan pitched a serviceable game, but he ended up on the wrong side of the scoreboard. There's nothing particularly spectacular about his numbers, either in the micro of this game or the macro of the season as a whole. On the micro level, he struck out one and walked one while surrendering eight hits in six innings. On the macro level, he holds a lackluster 5.08 ERA, 1.46 WHIP and 20/12 K/BB ratio over 51 1/3 innings. A home start against the Orioles is next up on his schedule.
Sat, Jun 13, 2015 07:17:00 PM

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.

O'Sullivan has by no means pitched well nor has he had any fantasy relevance, but he's done a decent job keeping the Phillies in ballgames as he's limited the opposition to three or fewer runs in five of eight starts. On Sunday, he worked around seven hits and two walks while striking out zero. The right-hander has a 4.96 ERA, 1.39 WHIP, and a 19/11 K/BB ratio. O'Sullivan will face the Pirates in Pittsburgh the next time he toes the rubber.
Sun, Jun 7, 2015 05:04:00 PM

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.

O'Sullivan scattered the four runs across his first four innings, then got into even more trouble in the sixth, but Justin De Fratus came in with two outs and bailed him out. O'Sullivan allowed nine hits and walked one while striking out one. He now has a 5.03 ERA with a 1.37 WHIP and a 19/9 K/BB ratio over 39 1/3 innings. He'll toe the rubber against the Giants at home in his next start.
Tue, Jun 2, 2015 10:43:00 PM

Sean O'Sullivan was demolished by the Mets on Wednesday, allowing seven runs in 5 2/3 innings en route to a loss.

Five of the runs came on four home runs, including two to Lucas Duda and another to opposing pitcher Noah Syndergaard. O'Sullivan gave up 11 hits in total while walking one and striking out two. He had pitched well in May, but he has always had an issue with the long ball so Wednesday's outing is no surprise. O'Sullivan is now 1-4 with a 4.81 ERA, a 1.31 WHIP, and an 18/8 K/BB ratio in 33 2/3 innings. He'll have to deal with the Reds in a home start next.
Wed, May 27, 2015 03:56:00 PM

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.

O'Sullivan punched out three on the night while walking one. He allowed a solo homer to Bryce Harper in the second inning and an RBI double to Ian Desmond in the sixth, but that was the extent of the damage. The right-hander will carry an impressive 3.54 ERA and 1.14 WHIP into Wednesday's start against the Mets in New York and could be worth a look as a streaming option in mixed leagues.
Fri, May 22, 2015 09:56:00 PM

Sean O'Sullivan got the win after tossing six shutout innings, helping the Phillies defeat the Diamondbacks by a 6-0 score on Sunday.

O'Sullivan had only once in his career tossed six shutout innings coming into Sunday afternoon's start. He scattered five hits and a pair of walks while striking out four in what was certainly one of the best starts of the journeyman's career. With the effort, the right-hander has a 3.68 ERA with a 1.18 WHIP and a 13/6 K/BB ratio in 22 innings. He's still a very risky play for fantasy purposes. O'Sullivan will take on the Nationals in a road start the next time he toes the rubber.
Sun, May 17, 2015 04:40:00 PM

Sean O'Sullivan gave up three runs in five innings, taking his second loss of the season on Tuesday against the Pirates.

All three runs came on Josh Harrison's home run in the fourth inning to snap a scoreless tie. He was otherwise solid, scattering five hits and a walk while striking out two. The Phillies aren't looking for anything stellar from the right-hander, so his 5.06 ERA isn't very troubling. Fantasy owners, however, should skip right past his name. O'Sullivan will finish off the Phillies' homestand in a start against the Diamondbacks on Sunday next.
Tue, May 12, 2015 10:58:00 PM

Sean O'Sullivan (knee) will begin a rehab assignment with Low-A Lakewood on Thursday.

It's uncertain how many rehab outings he'll need. With David Buchanan being sent to Triple-A, it appears that O'Sullivan will retain his rotation spot for now even with Chad Billingsley (elbow) returning from the disabled list.
Sun, May 3, 2015 10:00:00 AM

Depth Charts

C1Christian Vazquez
2Ryan Hanigan
1B1Hanley Ramirez
2B1Dustin Pedroia
SS1Xander Bogaerts
3B1Travis Shaw
2Pablo Sandoval
LF1Brock Holt
CF1Jackie Bradley
2Chris Young
RF1Mookie Betts
DH1David Ortiz
Starting Pitcher
S1David Price
2Clay Buchholz
3Rick Porcello
4Eduardo Rodriguez
5Joe Kelly
6Steven Wright
7Henry Owens
Relief Pitcher
R1Craig Kimbrel
2Koji Uehara
3Carson Smith
4Junichi Tazawa
5Robbie Ross
6Tommy Layne
7Matt Barnes
8Heath Hembree
9Pat Light
10Brandon Workman