OUTMason Thompson RP WSH Wed 10/29/25 7:59 PM
OUTMason Thompson
RP WSH
Thompson (biceps) cleared waivers Wednesday and elected free agency.
EDGE Analysis
Thompson appeared in 14 games for the Nationals this year, giving up 14 earned runs over just 10.2 innings. He ended the regular season on the injured list with biceps tendinitis, though he is expected to be fully recovered by the time spring training begins. His next gig will likely come in the form of a minor-league contract.
OUTMason Thompson RP WSH Tue 9/23/25 3:05 PM
OUTMason Thompson
RP WSH
The Nationals placed Thompson on the 15-day injured list Tuesday with right biceps tendinitis.
EDGE Analysis
The injury will end Thompson's season, though he should have a normal offseason, barring any setbacks. Thompson struggled mightily in 10.2 innings out of the Nationals' bullpen in 2025, finishing with an 11.81 ERA and 11:21 K:BB.
OUTMason Thompson RP WSH Sat 8/30/25 12:49 PM
OUTMason Thompson
RP WSH
The Nationals recalled Thompson from Triple-A Rochester on Saturday.
EDGE Analysis
Thompson struggled in his first stint with the Nationals this season, posting a 13.50 ERA, 3.00 WHIP and 3:6 K:BB over four innings spanning six relief appearances in July. However, he'll get another look in the majors in a corresponding move to MacKenzie Gore landing on the 15-day IL due to left shoulder inflammation. Thompson will likely serve in a low-leverage role out of the bullpen while up with Washington.
OUTMason Thompson RP WSH Tue 7/22/25 2:46 PM
OUTMason Thompson
RP WSH
The Nationals optioned Thompson to Triple-A Rochester on Tuesday.
EDGE Analysis
In his first six relief appearances since completing his recovery from Tommy John surgery and returning from the 60-day injured list, Thompson has been tagged for six runs with a 3:6 K:BB over four innings. He will try to get back on track at Rochester.
OUTMason Thompson RP WSH Sat 7/5/25 1:23 PM
OUTMason Thompson
RP WSH
The Nationals reinstated Thompson (elbow) from the injured list Saturday.
EDGE Analysis
Thompson has spent the entire season working his way back from a Tommy John procedure he underwent in March 2024. He gave up six earned runs over eight frames during his rehab assignment, though he went unscored upon in 1.1 innings at Triple-A Rochester. Now fully healthy, he'll replace Zach Brzykcy in Washington's bullpen and take Derek Law's (forearm) place on the 40-man.
OUTMason Thompson RP WSH Mon 6/16/25 5:09 PM
OUTMason Thompson
RP WSH
Thompson (elbow) will begin his rehab assignment with Double-A Harrisburg on Tuesday, Andrew Golden of The Washington Post reports.
EDGE Analysis
Thompson has been cleared to embark on a rehab assignment after his lone outing in the Florida League Complex on Saturday, when he allowed two hits and struck out two batters in one inning. The 27-year-old right-hander is taking the final steps of his recovery from Tommy John surgery in March of 2024. How Thompson's throwing elbow reacts to extended work in Double-A will determine a timeline for his return to the majors.
OUTMason Thompson RP WSH Fri 6/13/25 5:37 PM
OUTMason Thompson
RP WSH
Nationals manager Dave Martinez said Friday that Thompson (elbow) will make one more outing in the Florida Complex League before embarking on a rehab assignment, Spencer Nusbaum of The Washington Post reports.
EDGE Analysis
Thompson is in the final stages of his recovery from Tommy John surgery that he underwent in March of 2024. If all goes well with his next outing in the FCL, the 27-year-old right-hander will be given the green light to start a rehab assignment and work his way back up to the majors. He appeared in 51 regular-season games out of the bullpen for the Nationals in 2023 and posted a 5.50 ERA, 1.56 WHIP, three saves, 10 holds and a 44:22 K:BB across 54 innings.
OUTMason Thompson RP WSH Wed 2/19/25 11:09 AM
OUTMason Thompson
RP WSH
The Nationals placed Thompson (elbow) on the 60-day injured list Wednesday.
EDGE Analysis
Manager Dave Martinez indicated previously that Thompson had a chance to be ready in time for Opening Day following Tommy John surgery last March. However, the club has elected to proceed cautiously with the reliever, who is now ineligible to return until late May. Thompson's removal from the 40-man roster clears a spot for the newly-signed Lucas Sims.
OUTMason Thompson RP WSH Fri 2/14/25 5:02 PM
OUTMason Thompson
RP WSH
Nationals manager Dave Martinez said Friday that Thompson (elbow) has a chance to be ready in time for Opening Day, Spencer Nusbaum of The Washington Post reports.
EDGE Analysis
Thompson underwent Tommy John surgery in early March of last year, so he's less than a year removed from the operation. However, because he's a reliever, Martinez is giving him a shot to ramp up in time for the start of the season. That said, Thompson has yet to throw off a mound and might not do so until early March, so it's going to be a push to prep him for Opening Day.
OUTMason Thompson RP WSH Thu 11/21/24 7:23 PM
OUTMason Thompson
RP WSH
Thompson (elbow) agreed to a one-year contract with the Nationals on Thursday to avoid arbitration, Mark Zuckerman of MASNSports.com reports.
EDGE Analysis
Thompson underwent Tommy John surgery shortly after reporting to spring training. He's expected to miss at least part of the 2025 regular season, though he should contribute out of the Nationals' bullpen once healthy.