Sean Sullivan Fantasy Stats

Colorado Rockies pitching prospect Sean Sullivan is set to make his MLB debut on Friday night as his team's starter against the Athletics, per Kevin Henry of The Denver Gazette. The 23-year-old has largely struggled with Triple-A Albuquerque so far this season, recording a 5-3 record with a 5.60 ERA, 1.55 ERA, and 50 strikeouts across 54 2/3 innings (11 starts). However, he's been victimized by an abnormally high 14.7% HR/fly ball rate while pitching in the extremely hitter-friendly Pacific Coast League. Sullivan was much more productive across 97 1/3 innings (18 starts) with Double-A Hartford in 2025, logging a 3.14 ERA and 1.09 WHIP with a 24.2% strikeout rate. Sullivan will pitch in a hitter-friendly environment in Colorado, which lowers his fantasy appeal. Still, the young left-hander could be worth adding off the waiver wire in deeper league formats.

Colorado Rockies left-handed pitching prospect Sean Sullivan will attend MLB spring training. Sullivan is one of the top budding arms in the Colorado system and now has a path to make his MLB debut later in 2026. The southpaw is currently ranked as the team's No. 12 prospect on MLB.com. The former second-round selection out of Wake Forest spent the majority of his 2025 campaign with Double-A Hartford. Across 97 1/3 innings, the southpaw posted a strong 3.14 ERA with a 1.09 WHIP. While he only struck out 95 hitters, he continued to keep his ratios low. In 2024, Sullivan carried a similar 2.11 ERA with a 0.91 WHIP across 115 1/3 innings split between Low-A and High-A. If he turns in a productive camp, managers should expect the left-hander to be in the mix for a first-half MLB debut.

Colorado Rockies left-handed pitching prospect Sean Sullivan tossed seven innings of one-run ball en route to picking up the victory over Double-A Portland on Tuesday evening. In this outing, Sullivan allowed just four hits and no walks. He struck out seven. This was Sullivan's second-straight contest tallying at least seven punchouts. Since allowing four runs on June 19, Sullivan has logged 17 innings (three starts) to the tune of a 3.18 ERA with a 1.06 WHIP. The 22-year-old has logged 56 2/3 innings with Double-A Hartford this season and posted a strong 3.06 ERA with an impressive 0.94 WHIP. He has shown elite control, allowing just 10 walks. Given his steady production with Double-A, the No. 8-ranked prospect in the system should be in the mix to join Triple-A later this summer.

Colorado Rockies left-handed pitching prospect Sean Sullivan logged five shutout innings during his Double-A season debut on Wednesday evening. Sullivan was sidelined during the start of the season after recovering from hip surgery. He made one start in the Arizona Complex League and with Low-A before getting the call to return to Double-A. On Wednesday, Sullivan allowed just two hits and no walks against Binghamton. He struck out three batters. This was a strong season debut for Sullivan. Last season, the southpaw logged 32 innings with Double-A Hartford and held a strong 1.97 ERA with a 1.09 WHIP. If he continues to find success, he should be in the mix to make his Triple-A debut early in the 2025 season.

According to MLB Pipeline, Colorado Rockies starting pitching prospect Sean Sullivan is being invited to spring training. The 2023 second-round selection performed very well in his first professional season last summer. The left-handed pitcher opened the campaign at High-A and held a strong 2.16 ERA and a 0.84 WHIP across 83 1/3 innings of work. Across this stint, he struck out 101 batters and showed elite command, serving up just eight free passes. The No.10 ranked prospect in the Colorado system was then promoted to Double-A later in the summer. Through his first 32 innings with Double-A Hartford, Sullivan continued to dominate as he posted a 1.97 ERA and a 1.09 WHIP. He struck out 24 batters and allowed just seven walks. Sullivan could have a path to making his major league debut in 2025 if he carries this momentum into the early part of the season.

Colorado Rockies starting pitching prospect Sean Sullivan tossed five shutout innings and allowed just two hits and one free pass in his last start on July 28. He recorded 10 punchouts. This was his second straight start reaching the double-digit mark in strikeouts and not allowing a run. Over his past five starts, the southpaw sits with a stellar 1.29 ERA and 0.68 WHIP. Sullivan is making a strong case to reach Double-A by the end of the summer as he has not shown any sign of decline at High-A this season with an overall 2.16 ERA and 0.84 WHIP. The Wake Forest product is quickly climbing up prospect boards and should be a name to keep a close eye on in dynasty formats.

Colorado Rockies starting pitcher Sean Sullivan logged a dominant start on Tuesday evening as she tossed five shutout frames. She allowed just three hits and struck out 10. This was the third time this season that the southpaw tallied double-digit punchouts. The Wake Forest product has looked quite strong across his four starts, where he has held a 1.57 ERA, 0.70 WHIP, and a 2:26 BB:K ratio. The 22-year-old has remained at the High-A level all season and posted a cumulative 2.30 ERA, 0.86 WHIP, and a stellar 7:90 BB:K ratio. Sullivan is considered the 13th-best prospect in the Colorado system and should spend most of next summer in the upper levels of the minor leagues.

Colorado Rockies starting pitching prospect Sean Sullivan logged his first complete game of the season but was charged with a hard-luck loss in a 1-0 loss. He allowed five hits, one earned run, one free pass and struck out seven. After logging just two innings with Single-A last summer, Sullivan has been with High-A all season and looked quite sharp. Across 49 innings, the 2023 second-round selection has posted a 2.37 ERA, 0.93 WHIP, and 4:57 BB:K ratio. The 21-year-old had one blow-up start on May 17, where he allowed six runs, but never allowed more than 3 in any other outing this season. The Wake Forest product is projected to reach the majors in 2026 but could push for a 2025 debut, especially if he reaches Double-A later this summer.

Colorado Rockies starting pitching prospect Sean Sullivan continued to showcase his elite strikeout potential with eight punchouts in Thursday's victory. Through his first 40 innings at High-A, the 21-year-old has tallied 50 punchouts and only allowed three free passes. He has tallied at least eight punchouts in three of his starts, with his season-high being 13. Overall, he holds a solid 2.68 ERA and 0.99 WHIP through seven starts. Sullivan logged only two innings at Single-A last season and was immediately sent to Double-A to begin this season. The right-hander is projected to reach the majors in 2026, but that window could change thanks to the elite command he has shown in the first two months of the campaign.