15-Day IL
Injury Biceps
Est. Return 2/1/2026
2025 Stats
W-L
1-1
ERA
11.81
WHIP
2.63
K
11
SV
0
Rest-of-Season Projections
Signed a one-year, $770,000 contract with the Nationals in November of 2024.
Shelved with biceps tendinitis
The Nationals placed Thompson on the 15-day injured list Tuesday with right biceps tendinitis.
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.
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.
Pitching Stats
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2025 MLB Game Log
2025
2024
2023
2022
2021
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
17
Last 10 Games
19
Last 5 Games
26
How many pitches does Mason Thompson generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Mason Thompson generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
-11%
BAA vs RHP
2025
-16%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .323 | 24 | 23 | 31 | 2 | |||
| Since 2023vs Right | .288 | 31 | 11 | 47 | 3 | |||
| 2025vs Left | .368 | 6 | 8 | 7 | 0 | |||
| 2025vs Right | .310 | 5 | 4 | 9 | 1 | |||
| 2024vs Left | 0 | 0 | 0 | 0 | 0 | |||
| 2024vs Right | 0 | 0 | 0 | 0 | 0 | |||
| 2023vs Left | .312 | 18 | 15 | 24 | 2 | |||
| 2023vs Right | .284 | 26 | 7 | 38 | 2 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
-48%
ERA at Home
2025
-37%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 4.34 | 1.45 | 29.0 | 5.9 | 5.6 | ||||
| Since 2023Away | 8.33 | 1.96 | 35.2 | 9.1 | 4.0 | ||||
| 2025Home | 9.00 | 2.40 | 5.0 | 9.0 | 12.6 | ||||
| 2025Away | 14.29 | 2.82 | 5.2 | 9.5 | 7.9 | ||||
| 2024Home | 0 | 0 | 0 | 0 | 0 | ||||
| 2024Away | 0 | 0 | 0 | 0 | 0 | ||||
| 2023Home | 3.38 | 1.25 | 24.0 | 5.3 | 4.1 | ||||
| 2023Away | 7.20 | 1.80 | 30.0 | 9.0 | 3.3 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Mason Thompson compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
0.92K/9
9.3BB/9
10.1HR/9
0.8Fastball
94.9 mphERA
11.81WHIP
2.63BABIP
.440GB/FB
2.00Left On Base
45.1%Exit Velocity
84.3 mphBarrels/BBE
4.6%Spin Rate
2201 rpmBalls Hit 95+ MPH
27.7%Swinging Strike
6.9%Prospect Rankings History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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2017 Fantasy Outlook
Tommy John surgery in his junior year of high school dropped Thompson to the third round of the 2016 first-year player draft, when the Padres took a gamble on the 19-year-old and swayed him from a Texas commitment with $1.75 million. Thompson has some work to do to fill out his 6-foot-7, 186-pound frame, but he has the stuff to succeed if he can do so. He posts good velocity and has some decent backup pitches, which he showed off in 12 innings for the Padres' rookie league team in the Arizona League. Thompson struck out 12 batters in his five starts, allowing just eight hits en route to a 2.25 ERA and 1.08 WHIP. He'll begin next season in a low minor league level, but the Padres will have high hopes for his success if he can stay healthy and begin to add more strength.
More Fantasy News
Back up with big club
The Nationals recalled Thompson from Triple-A Rochester on Saturday.
Analysis
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Moves down to Triple-A
The Nationals optioned Thompson to Triple-A Rochester on Tuesday.
Analysis
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Back from injured list
The Nationals reinstated Thompson (elbow) from the injured list Saturday.
Analysis
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Cleared for rehab assignment
Thompson (elbow) will shift his rehab assignment with Double-A Harrisburg on Tuesday, Andrew Golden of The Washington Post reports.
Analysis
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Close to rehab assignment
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.
Analysis
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Latest Fantasy Rumors
Out of high-leverage mix?
Thompson delivered a scoreless inning during Tuesday's 7-4 loss to San Diego, but Mark Zuckerman of MASNSports.com speculated the right-hander is no longer a trusted high-leverage option for manager Dave Martinez.
Analysis
Thompson's entered Tuesday's contest having been scored upon in each of his previous five outings, so it's not a major surprise he's fallen out of favor a bit. The 25-year-old had a 1.80 ERA, 0.70 WHIP and 19:1 K:BB across his first 20 innings of the season, and a return to that form could see him once again become a high-leverage option, though he's unlikely to be in the mix for saves without multiple injuries within the Nationals bullpen.
Thompson's entered Tuesday's contest having been scored upon in each of his previous five outings, so it's not a major surprise he's fallen out of favor a bit. The 25-year-old had a 1.80 ERA, 0.70 WHIP and 19:1 K:BB across his first 20 innings of the season, and a return to that form could see him once again become a high-leverage option, though he's unlikely to be in the mix for saves without multiple injuries within the Nationals bullpen.