| Date | Team | Opp | Result | Dec | GS | IP | AB | BF | H | R | ER | HR | BB | IBB | SO | HBP | SH | SF | WP | BK | ERA | WHIP | K/9 | BB/9 | FIP | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013 | ||||||||||||||||||||||||||
| Season Total 3-1 | 5 | 30.2 | 103 | 114 | 21 | 8 | 8 | 2 | 8 | — | 26 | 3 | — | — | 0 | — | 2.35 | 0.95 | 7.63 | 2.35 | 3.54 | 157 |
| Year | Level | Team | Org | G | PA | AB | R | H | TB | 2B | 3B | HR | RBI | BB | SO | SB | CS | HBP | SF | SAC | GIDP | AVG | OBP | SLG | OPS | BABIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | MLB | Washington Nationals | Washington Nationals | 3 | 5 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 1 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | — |
| 2018 | MLB | Washington Nationals | Washington Nationals | 11 | 17 | 16 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 5 | 0 | 0 | 0 | 0 | 0 | 1 | 0.063 | 0.118 | 0.063 | 0.181 | 0.091 |
| 2019 | MLB | Washington Nationals | Washington Nationals | 21 | 20 | 15 | 1 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 5 | 0 | 0.133 | 0.133 | 0.133 | 0.266 | 0.222 |
| 2021 | MLB | Washington Nationals | Washington Nationals | 29 | 43 | 36 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 14 | 0 | 0 | 0 | 1 | 5 | 0 | 0.000 | 0.026 | 0.000 | 0.026 | — |
| 2017–2021 | MLB | Career (4 yrs) | 64 | 85 | 71 | 2 | 3 | 3 | 0 | 0 | 0 | 1 | 2 | 28 | 0 | 0 | 0 | 1 | 11 | 1 | 0.042 | 0.068 | 0.042 | 0.110 | — |
| Year | Level | Team | Org | G | GS | IP | H | R | ER | BB | SO | HR | W | L | SV | ERA | WHIP | K/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2016 | AA | Harrisburg | Washington Nationals | 5 | 5 | 29.1 | 33 | 13 | 13 | 10 | 28 | 1 | 2 | 1 | 0 | 3.99 | 1.47 | 8.59 |
| 2017 | AA | Harrisburg | Washington Nationals | 17 | 7 | 56.1 | 45 | 21 | 19 | 18 | 54 | 4 | 3 | 3 | 0 | 3.04 | 1.12 | 8.63 |
| 2017 | AAA | Syracuse | Washington Nationals | 12 | 6 | 34.0 | 37 | 18 | 18 | 5 | 25 | 3 | 1 | 2 | 0 | 4.76 | 1.24 | 6.62 |
| 2017 | MLB | Washington Nationals | Washington Nationals | 3 | 3 | 15.1 | 25 | 16 | 16 | 8 | 15 | 5 | 0 | 1 | 0 | 9.39 | 2.15 | 8.80 |
| 2018 | AA | Harrisburg | Washington Nationals | 1 | 1 | 4.0 | 4 | 1 | 1 | 2 | 4 | 0 | 0 | 1 | 0 | 2.25 | 1.50 | 9.00 |
| 2018 | AAA | Syracuse | Washington Nationals | 13 | 13 | 67.1 | 78 | 34 | 33 | 18 | 70 | 3 | 3 | 3 | 0 | 4.41 | 1.43 | 9.36 |
| 2018 | MLB | Washington Nationals | Washington Nationals | 11 | 11 | 50.1 | 55 | 31 | 31 | 22 | 46 | 8 | 2 | 4 | 0 | 5.54 | 1.53 | 8.23 |
| 2019 | AA | Harrisburg | Washington Nationals | 5 | 4 | 24.2 | 18 | 9 | 7 | 5 | 27 | 2 | 2 | 0 | 0 | 2.55 | 0.93 | 9.85 |
| 2019 | AAA | Fresno | Washington Nationals | 2 | 2 | 10.0 | 19 | 14 | 14 | 4 | 10 | 5 | 1 | 1 | 0 | 12.60 | 2.30 | 9.00 |
| 2019 | MLB | Washington Nationals | Washington Nationals | 21 | 12 | 78.0 | 81 | 39 | 39 | 33 | 41 | 11 | 4 | 2 | 0 | 4.50 | 1.46 | 4.73 |
| 2020 | MLB | Washington Nationals | Washington Nationals | 11 | 8 | 50.1 | 47 | 25 | 24 | 22 | 28 | 10 | 2 | 4 | 0 | 4.29 | 1.37 | 5.01 |
| 2021 | A+ | Wilmington | Washington Nationals | 1 | 1 | 5.0 | 5 | 2 | 2 | 1 | 3 | 0 | 0 | 1 | 0 | 3.60 | 1.20 | 5.40 |
| 2021 | MLB | Washington Nationals | Washington Nationals | 29 | 27 | 133.1 | 144 | 90 | 81 | 48 | 128 | 23 | 7 | 9 | 0 | 5.47 | 1.44 | 8.64 |
| 2022 | AAA | Rochester | Washington Nationals | 1 | 1 | 4.0 | 3 | 0 | 0 | 1 | 4 | 0 | 0 | 0 | 0 | 0.00 | 1.00 | 9.00 |
| 2022 | MLB | Washington Nationals | Washington Nationals | 27 | 27 | 127.0 | 149 | 84 | 82 | 58 | 94 | 21 | 6 | 13 | 0 | 5.81 | 1.63 | 6.66 |
| 2024 | MLB | 2 Teams | 2 Teams | 31 | 31 | 177.1 | 154 | 66 | 65 | 52 | 154 | 20 | 9 | 9 | 0 | 3.30 | 1.16 | 7.82 |
| 2025 | MLB | 2 Teams | 2 Teams | 32 | 24 | 141.0 | 147 | 90 | 86 | 67 | 83 | 19 | 4 | 13 | 0 | 5.49 | 1.52 | 5.30 |
| 2026 | MLB | Chicago | Chicago | 29 | 13 | 123.1 | 124 | 65 | 57 | 45 | 88 | 22 | 7 | 8 | 0 | 4.16 | 1.37 | 6.42 |
| 2017–2026 | MLB | Career (9 yrs) | 194 | 156 | 896.0 | 926 | 506 | 481 | 355 | 677 | 139 | 41 | 63 | 0 | 4.83 | 1.43 | 6.80 | |
| 2017–2022 | AAA | Career (4 yrs) | 28 | 22 | 115.1 | 137 | 66 | 65 | 28 | 109 | 11 | 5 | 6 | 0 | 5.07 | 1.43 | 8.51 | |
| 2016–2019 | AA | Career (4 yrs) | 28 | 17 | 114.1 | 100 | 44 | 40 | 35 | 113 | 7 | 7 | 5 | 0 | 3.15 | 1.18 | 8.90 | |
| 2021 | A+ | Career (1 yr) | 1 | 1 | 5.0 | 5 | 2 | 2 | 1 | 3 | 0 | 0 | 1 | 0 | 3.60 | 1.20 | 5.40 |