| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 8 | 8 | 0 | 0 | 160.0 | 157 | 28 | 124 | 66 | 3.73 | 1.159 | 37.1 |
| 2026 | 0 | 2 | 0 | 0 | 19.0 | 27 | 6 | 14 | 15 | 7.11 | 1.737 | -57.5 |
| 2025 | 10 | 8 | 0 | 0 | 186.7 | 174 | 32 | 130 | 79 | 3.81 | 1.104 | 50.7 |
| 2024 | 8 | 10 | 0 | 0 | 156.3 | 164 | 31 | 141 | 60 | 3.45 | 1.247 | 51.3 |
| Date | News |
| 4/18/26 | Nationals return home with a blowout loss to Giants. Zack Littell gave up eight runs in four innings, giving Washington no chance after a 5-2 road trip. Source: https://www.washingtonpost.com/sports/2026/04/17/n... |
| 3/09/26 | Sources: Nationals reach deal with RHP Littell. Zack Littell has a new home after agreeing to a one-year contract with the Nationals, sources told ESPN's Jeff Passan and Kiley McDaniel. Source: https://www.espn.com/mlb/story/_/id/48145521/sourc... |
| 3/09/26 | Sources: Nationals reach deal with RHP Littell. Zack Littell has a new home after agreeing to a one-year contract with the Nationals, sources told ESPN's Jeff Passan and Kiley McDaniel. Source: https://www.espn.com/mlb/story/_/id/48145521/sourc... |
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