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    SeanO'Sullivan

    • Starting Pitcher
    • Birthdate
      9/1/1987
    • BAT/THR
      Right/Right
    • Birthplace
      San Diego, CA

    Career Stats

    • W-L
      13-23
      ERA
      6.01
      K
      158
      WHIP
      1.58
    • Overview
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    Career
    GPGSCGSHOIPHRERHRBBK
    715600323.239822621659115158
    Latest News
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    Racing Positions

      • Red Sox demote Vazquez, send Buchholz to pen
        • 10Y
        • Kyle Brasseur
        Buchholz
        • Red Sox keep slow-starting Buchholz in rotation
          • 10Y
          • Tony Lee
          Clay Buchholz
          • Reds OF Byrd fractures wrist on HBP vs. Phillies
            • 2Y
            Marlon Byrd
            • Fantasy baseball news: Castillo removed from White Sox rotation and more for Friday
              • 13m
              • ESPN Fantasy
              Chicago White Sox starting pitcher Luis Castillo (58) has a pitchers mound visit against the Houston Astros in the third inning at Daikin Park.
              • Fantasy Baseball Forecaster for Week 25: Sept. 21-27
                • 2h
                • Tristan H. Cockcroft
                New York Yankees catcher Austin Wells (28) celebrates with designated hitter Ben Rice (22) after hitting a solo home run in the fourth inning against the Tampa Bay Rays.
                • Fantasy baseball forecaster: Team hitting ratings
                  • 3h
                  • Tristan H. Cockcroft
                  Los Angeles Dodgers first baseman Freddie Freeman (5) rounds third base to score in the third inning against the Los Angeles Angels at Dodger Stadium.
                  • Fantasy baseball forecaster: Pitcher projections for the next 10 days
                    • 3h
                    • Tristan H. Cockcroft
                    Philadelphia Phillies starting pitcher Cristopher Sánchez (61) flips the ball to first base in the first inning New York Mets at Citi Field.
                    • Reliever depth chart: Who's closing, who's tired and who's next?
                      • 3h
                      • Fantasy Staff
                      San Diego Padres' Mason Miller looks on during the ninth inning of a baseball game against the Milwaukee Brewers.
                      • MLB betting tips for Friday: Burns likely to struggle against Cubs
                        • 4h
                        • Derek Carty
                        Cincinnati Reds pitcher Chase Burns throws during the first inning of a baseball game against the Milwaukee Brewers, Sunday, Sept. 13, 2026, in Milwaukee.
                        • 'That pitch was like a flash': Jacob Misiorowski's epic season, through those who have watched it
                          • 5h
                          • Jesse Rogers
                          'That pitch was like a flash': Jacob Misiorowski's epic season, through those who have watched it

                        MLB News

                        MLB betting tips for Friday: Burns likely to struggle against Cubs

                        MLB betting tips for Friday: Burns likely to struggle against Cubs

                        All of the odds, recommended prop bets and trends in baseball for Friday, September 18.
                        Witnessing Jacob Misiorowski's Cy Young-worthy season

                        Witnessing Jacob Misiorowski's Cy Young-worthy season

                        What's it like seeing a Cy Young favorite unleash a 105 mph fastball? We asked those around the Brewers' breakout star.
                        MLB playoffs 2026: Fatal October flaws for every contender

                        MLB playoffs 2026: Fatal October flaws for every contender

                        Tired of seeing your favorite team go home early in the postseason? Here's one thing each current playoff team needs to address to make a deep run.
                        MLB playoff picture 2026: Clinching scenarios, bracket, schedule

                        MLB playoff picture 2026: Clinching scenarios, bracket, schedule

                        From current playoff matchups to league races to the postseason schedule, we have everything you need to know.
                        Murakami hits 3-run homer, White Sox top Tigers 3-1 to move into 1st place tie in AL Central

                        Murakami hits 3-run homer, White Sox top Tigers 3-1 to move into 1st place tie in AL Central

                        — Munetaka Murakami hit his team-leading 32nd home run and the Chicago White Sox moved into a tie with idle Cleveland for first place in the AL Central with a 3-1 win over the Detroit Tigers on Thursday night.
                        Rays open 5-game AL East lead, beat Athletics 10-1 for 6th straight win

                        Rays open 5-game AL East lead, beat Athletics 10-1 for 6th straight win

                        — Drew Rasmussen pitched five scoreless innings and the Tampa Bay Rays opened a five-game AL East lead with a 10-1 win over the Athletics on Thursday that extended their winning streak to six.
                        All MLB News
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