Sean Guenther
YEARTEAMGGSCGSHOWLSIPHitsERSOBBHRERA
2025Rampage80000007.1742524.91
MLB Player Data
DateNewsComment
May 23 2025The Tigers optioned Guenther to Triple-A Toledo on Friday, Evan Petzold of the Detroit Free Press reports. ROTOWIRE RECOMMENDS: Guenther has yielded seven runs (six earned) with an 8:5 K:BB over 10.1 innings with the big club this season. He's clearing out to make room on the roster for the return of Matt Vierling (shoulder).
May 19 2025Guenther will serve as the Tigers' opening pitcher for Monday's game against the Cardinals, Chris McCosky of The Detroit News reports. ROTOWIRE RECOMMENDS: Guenther will draw his first MLB start Monday, though he hasn't covered more than two innings in any of his nine appearances between the big club and the minors this season and is unlikely to work deep into the contest. Keider Montero is slated to cover the bulk of the innings out of the bullpen once Guenther exits the game.
Mar 17 2025Guenther was optioned to Triple-A Toledo on Monday, Chris McCosky of The Detroit News reports. ROTOWIRE RECOMMENDS: Guenther gave up seven earned runs in 3.2 innings this spring. His demotion clears the way for Brant Hurter to make the team as the second lefty out of the bullpen.
Feb 10 2025Guenther has a good chance to make Detroit's bullpen coming out of spring training, Jason Beck of MLB.com reports. ROTOWIRE RECOMMENDS: Guenther saw some work with the Tigers down the stretch last season and pitched well, turning in a 0.86 ERA and 0.52 WHIP across 21 innings. The lefty could now parlay that into an Opening Day bullpen role if he has a strong spring training. Guenther would likely see low-leverage opportunities in the early going, though he could seize a larger role at some point if he continues to impress.
Aug 22 2024The Tigers recalled Guenther from Triple-A Toledo on Thursday. ROTOWIRE RECOMMENDS: Guenther made one relief appearance with the Tigers earlier this month, allowing one earned run over 1.1 innings of work. The left-hander will likely be with the big club only for a few days until Alex Faedo is back from paternity leave.
Aug 4 2024The Tigers optioned Guenther to Triple-A Toledo on Sunday. ROTOWIRE RECOMMENDS: He'll cede his spot on the active roster to lefty Brant Hurter, who was called up from Triple-A in a corresponding move and is expected to work in bulk relief behind opening pitcher Alex Faedo in Sunday's game against the Royals. Following his promotion from Toledo on Thursday, Guenther made one appearance out of the Detroit bullpen, giving up an earned run on one hit and two hit batsmen over 1.1 innings.
Aug 1 2024The Tigers selected Guenther's contract from Triple-A Toledo on Thursday, Cody Stavenhagen of The Athletic reports. ROTOWIRE RECOMMENDS: Guenther is one of the arms being added as the Tigers replace some pitchers they traded away earlier this week. The lefty holds a 3.86 ERA and 46:14 K:BB across 44.1 innings with Toledo this season. He has not made an appearance in the majors since 2021.
Nov 15 2022Guenther (elbow) cleared waivers and was outrighted to Triple-A Toledo on Tuesday. ROTOWIRE RECOMMENDS: The 27-year-old finished the season on Detroit's 60-day injured list but won't be added back to the 40-man roster for the offseason. Guenther underwent Tommy John surgery in April and is likely to miss at least the first half of the 2023 campaign.
Nov 9 2022Guenther (elbow) has resumed throwing off flat ground from 75 feet and is expected to be ready to pitch off a mound by the end of spring training, Evan Petzold of the Detroit Free Press reports. ROTOWIRE RECOMMENDS: After scooping Guenther up off waivers from the Marlins on Nov. 2, the Tigers immediately moved him to the 60-day injured list. He'll likely remain on IL for much of the first half of the 2023 campaign, as he's in the early stages of his throwing progression following his Tommy John surgery last April.
Nov 2 2022The Tigers claimed Guenther (elbow) off waivers from the Marlins on Wednesday. ROTOWIRE RECOMMENDS: Detroit will immediately move Guenther to its 60-day injured list, where he'll open the 2023 season while he continues to recover from the Tommy John surgery he underwent in April. The 26-year-old southpaw's lone big-league action to date came in 2021, when he yielded a 9.30 ERA and 2.02 WHIP in 20.1 innings out of the Miami bullpen.
Apr 8 2022Guenther underwent Tommy John surgery Thursday, Jordan McPherson of the Miami Herald reports. ROTOWIRE RECOMMENDS: Reports emerged last week that Guenther would need surgery, though exactly what type of procedure he'd need wasn't specified. Tommy John surgery rules him out for all of this season plus a fair portion of next year as well.
Apr 3 2022Guenther (arm) was placed on the 60-day injured list Sunday, Christina De Nicola of MLB.com reports. ROTOWIRE RECOMMENDS: Guenther was diagnosed with an arm injury recently that will likely require surgery, and the southpaw will be unavailable for at least the first two months of the regular season. He made his major-league debut last year and posted a 9.30 ERA and 2.02 WHIP in 20.1 innings across 14 relief appearances. It's not yet clear when he'll be able to return to game action.
Oct 3 2021The Marlins placed Guenther on the 10-day injured list Sunday with an upper-back strain, Christina De Nicola of MLB.com reports. ROTOWIRE RECOMMENDS: Guenther's move to the IL clears a spot on the active roster for pitcher Pablo Lopez (shoulder), who was reinstated from the 60-day IL ahead of his scheduled start Sunday against the Phillies. Over 14 relief appearances with Miami spanning 20.1 innings, Guenther was lit up for 21 earned runs on 31 hits and 10 walks.
Aug 14 2021The Marlins recalled Guenther from Triple-A Jacksonville on Saturday, Christina De Nicola of MLB.com reports. ROTOWIRE RECOMMENDS: The lefty was sent down Monday after appearing in two games, allowing four runs over 2.2 innings in the second one. Given his poor performance, Guenther figures to pitch in nothing more than extremely low-leverage situations, if at all.
Aug 9 2021Guenther was optioned to Triple-A Jacksonville on Monday, Christina De Nicola of MLB.com reports. ROTOWIRE RECOMMENDS: Guenther spent a week in the Marlins' bullpen after his contract was selected last Sunday, but he'll head back to the minors after he allowed four runs in 2.2 innings in Sunday's loss to the Rockies. Left-hander Shawn Morimando's contract was selected from Triple-A Jacksonville as part of a move to take his place in the bullpen.
Aug 1 2021Guenther had his contract selected by the Marlins on Sunday, Christina De Nicola of MLB.com reports. ROTOWIRE RECOMMENDS: Guenther has split the season between Double-A Pensacola and Triple-A Jacksonville, and he'll now receive his first taste of the big leagues. The 25-year-old posted a 1.02 ERA and 26:3 K:BB over 17.2 frames at Double-A, but he's struggled since being promoted to Triple-A with a 4.76 ERA, 1.10 WHIP and 28:4 K:BB across 22.2 innings.