Mason Thompson
#22 P · B/T: R/R · 6' 6", 241 lb · Age 28 · Round Rock, TX, USA · MLB debut 2021 · Draft: 2016 Rd 3 #85 (SD) — Round Rock (TX) HS · Washington Nationals
Career Graph
Pitching
| Season | Team | W | L | SV | G | GS | QS | IP | IP/G | SO | K/9 | BB/9 | ERA | FIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | WSH | 1 | 3 | 0 | 31 | 0 | — | 24.2 | 0.8 | 23 | 8.4 | 5.5 | 4.01 | — | — |
| 2022 | WSH | 1 | 1 | 1 | 24 | 0 | — | 24.2 | 1.0 | 15 | 5.5 | 3.3 | 2.92 | — | — |
| 2025 | WSH | 1 | 1 | 0 | 14 | 0 | 0 | 10.2 | 0.8 | 11 | 9.3 | 10.1 | 11.81 | 5.67 | -0.1 |
| Career | 3 | 5 | 1 | 69 | 0 | 0 | 60.0 | 0.9 | 49 | 7.4 | 5.4 | 4.95 | — | -0.1 |
| Season | Team | W | L | SV | G | GS | QS | IP | IP/G | SO | K/9 | BB/9 | ERA |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Triple-A (AAA) | |||||||||||||
| 2021 | ELP | 3 | 2 | 7 | 23 | 0 | — | 26.2 | 1.2 | 24 | 8.1 | 2.7 | 5.74 |
| 2022 | ROC | 0 | 4 | 0 | 11 | 1 | — | 15.1 | 1.4 | 19 | 11.2 | 2.9 | 3.52 |
| 2025 | ROC | 0 | 1 | 0 | 10 | 0 | 0 | 9.2 | 1.0 | 10 | 9.3 | 5.6 | 5.59 |
| 2026 | RR |
4
|
3
|
4
|
37
|
3
|
— |
37.2
|
1.0
|
39
|
9.3
|
3.8
|
5.97
|
| 2026 pace | 5 | 4 | 5 | 49 | 4 | 49.2 | 51 | ||||||
| AAA Total | 7 | 10 | 11 | 81 | 4 | 0 | 89.1 | 1.1 | 92 | 9.3 | 3.5 | 5.44 | |
| Double-A (AA) | |||||||||||||
| 2023 | HBG | 0 | 0 | 0 | 1 | 0 | — | 1.0 | 1.0 | 1 | 9.0 | 0.0 | 0.00 |
| 2025 | HBG | 0 | 1 | 0 | 4 | 1 | 0 | 5.2 | 1.4 | 7 | 11.1 | 6.4 | 9.53 |
| AA Total | 0 | 1 | 0 | 5 | 1 | 0 | 6.2 | 1.3 | 8 | 10.8 | 5.4 | 8.10 | |
| High-A (A+) | |||||||||||||
| 2019 | LE | 0 | 5 | 0 | 7 | 6 | — | 22.1 | 3.2 | 22 | 8.9 | 7.7 | 7.66 |
| A+ Total | 0 | 5 | 0 | 7 | 6 | — | 22.1 | 3.2 | 22 | 8.9 | 7.7 | 7.66 | |
| Single-A (A) | |||||||||||||
| 2017 | FW | 2 | 4 | 0 | 7 | 7 | — | 27.0 | 3.9 | 28 | 9.3 | 4.0 | 4.67 |
| 2018 | FW | 6 | 8 | 0 | 22 | 20 | — | 93.0 | 4.2 | 97 | 9.4 | 3.6 | 4.94 |
| A Total | 8 | 12 | 0 | 29 | 27 | — | 120.0 | 4.1 | 125 | 9.4 | 3.7 | 4.88 | |
| Rookie (Rk) | |||||||||||||
| 2016 | A-PAD | 0 | 0 | 0 | 5 | 5 | — | 12.0 | 2.4 | 12 | 9.0 | 3.8 | 2.25 |
| 2019 | A-PA2 | 0 | 0 | 0 | 3 | 2 | — | 5.0 | 1.7 | 3 | 5.4 | 5.4 | 5.40 |
| 2022 | F-NAT | 0 | 0 | 0 | 3 | 3 | — | 2.2 | 0.9 | 7 | 23.6 | 0.0 | 3.38 |
| 2025 | F-NAT | 0 | 0 | 0 | 1 | 0 | — | 1.0 | 1.0 | 2 | 18.0 | 0.0 | 0.00 |
| Rk Total | 0 | 0 | 0 | 12 | 10 | — | 20.2 | 1.7 | 24 | 10.5 | 3.5 | 3.05 | |
| Minors Total | 15 | 28 | 11 | 134 | 48 | 0 | 259.0 | 1.9 | 271 | 9.4 | 4.0 | 5.25 | |
Batting
| Season | Team | G | PA | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | BB% | K% | AVG | OBP | SLG | OPS | wOBA | wRC+ | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | WSH | 31 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | .000 | .000 | .000 | .000 | — | — | — |
| Career | 31 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — | — | — | — | — |
| Season | Team | G | PA | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | OBP | SLG | OPS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Triple-A (AAA) | |||||||||||||||||
| 2021 | ELP | 23 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | .000 | .000 | .000 |
| AAA Total | 23 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | |
Fielding
| Season | Team | Pos | G | Inn | PO | A | E | FPCT |
|---|---|---|---|---|---|---|---|---|
| Triple-A (AAA) | ||||||||
| 2021 | ELP | P | 23 | 26.2 | 1 | 4 | 0 | 1.000 |
| 2022 | ROC | P | 11 | 15.1 | 0 | 1 | 0 | 1.000 |
| 2025 | ROC | P | 10 | 9.2 | 0 | 1 | 0 | 1.000 |
| 2026 | RR |
P
|
37
|
37.2
|
2
|
3
|
0
|
1.000
|
| AAA Total | — | 81 | 89.1 | 3 | 9 | 0 | 1.000 | |
| Double-A (AA) | ||||||||
| 2023 | HBG | P | 1 | 1.0 | 0 | 0 | 0 | .000 |
| 2025 | HBG | P | 4 | 5.2 | 0 | 0 | 0 | .000 |
| AA Total | — | 5 | 6.2 | 0 | 0 | 0 | — | |
| High-A (A+) | ||||||||
| 2019 | LE | P | 7 | 22.1 | 1 | 2 | 1 | .750 |
| A+ Total | — | 7 | 22.1 | 1 | 2 | 1 | .750 | |
| Single-A (A) | ||||||||
| 2017 | FW | P | 7 | 27.0 | 2 | 3 | 1 | .833 |
| 2018 | FW | P | 22 | 93.0 | 6 | 8 | 2 | .875 |
| A Total | — | 29 | 120.0 | 8 | 11 | 3 | .864 | |
| Rookie (Rk) | ||||||||
| 2016 | A-PAD | P | 5 | 12.0 | 2 | 0 | 0 | 1.000 |
| 2019 | A-PA2 | P | 3 | 5.0 | 1 | 0 | 0 | 1.000 |
| 2022 | F-NAT | P | 3 | 2.2 | 0 | 0 | 1 | .000 |
| 2025 | F-NAT | P | 1 | 1.0 | 0 | 0 | 0 | .000 |
| Rk Total | — | 12 | 20.2 | 3 | 0 | 1 | .750 | |
| Minors Total | — | 134 | 259.0 | 15 | 22 | 5 | .881 | |
over the trailing
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