![Sean O'Sullivan](https://images.fantasypros.com/images/players/mlb/3924/headshot/70x70.png)
Sean O'Sullivan
SP - FA
2025 Outlook
Roster %
Eligibility
Availability
Sean O'Sullivan was charged with four runs in five innings in a no-decision against the Rays on Friday, giving up seven hits and a walk while striking out four.
Fantasy Impact
After a strong start on Sunday, there was hope the O'Sullivan could repeat the performance on Friday night against the Rays. He struggled and his ERA on the season rises to 6.75 with a hefty 1.69 WHIP to match. O'Sullivan will be replaced in the rotation if the Red Sox could ever find someone capable. He should not be owned in any fantasy leagues.
Sean O'Sullivan pitched a solid game in Sunday's win over the Angels, allowing two runs on four hits over five-plus innings. He also struck out two and walked three.
Fantasy Impact
This was just a spot start for the journeyman pitcher but he made the most of the opportunity. O'Sullivan now has a 6.61 ERA and 1.71 WHIP over 16 1/3 innings and it would take a few more starts like this to even consider him fantasy worthy.
Sean O'Sullivan's contract was purchased from Triple-A Pawtucket, MLB.com reports. He'll get the start Sunday against the Angels.
Fantasy Impact
This will be just a spot start for O'Sullivan who pitched for the Red Sox earlier in the season and had a 7.94 ERA and 1.85 WHIP in three games pitched. The way the Angels beat up on Red Sox pitching on Saturday it will be wise to avoid O'Sullivan in DFS and any streaming opportunities.
Sean O'Sullivan was designated for assignment after his start Sunday, Mass Live reports. This move was entirely expected. O'Sullivan, who gave up six runs (five earned) on five hits and two walks Sunday, was filling in for a couple of turns through the rotation.
Fantasy Impact
O'Sullivan finished his brief time as a Red Sox starter with a 1-0 record with a 6.44 ERA and 2.00 WHIP with four strikeouts. With the Red Sox getting Eduardo Rodriguez and Joe Kelly off the DL soon, they have no need for O'Sullivan.
Sean O'Sullivan (1-0) allowed four runs on 12 hits with three strikeouts over six innings in a win Tuesday against the Athletics.
Fantasy Impact
The Red Sox scored 11 runs in the first five innings to give O'Sullivan a nice cushion. He gave the Red Sox what they needed going six innings and was able to get out of some jams. O'Sullivan may get another start as the Red Sox are waiting for Eduardo Rodriguez to be ready after his rehab stint in Triple-A.