| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 8 | 9 | 0 | 0 | 136.0 | 135 | 42 | 119 | 61 | 4.04 | 1.301 | 25.2 |
| 2026 | 2 | 0 | 0 | 0 | 20.7 | 19 | 7 | 19 | 7 | 3.05 | 1.258 | 57.3 |
| 2022 | 0 | 0 | 0 | 0 | 6.0 | 7 | 5 | 3 | 6 | 9.00 | 2.000 | -5.1 |
| 2020 | 1 | 0 | 0 | 0 | 1.7 | 0 | 0 | 1 | 0 | 0.00 | 0.000 | 8.1 |
| Date | News |
| 4/16/26 | Foster Griffin, with seven pitches and a binder of secrets, is dealing. After a detour in Japan, Griffin is rebuilding his career in Washington — and is a bright spot on a strugging staff. Source: https://www.washingtonpost.com/sports/2026/04/16/f... |
| 4/16/26 | Foster Griffin, with seven pitches and a binder of secrets, is dealing. After a detour in Japan, Griffin is rebuilding his career in Washington — and is a bright spot on a strugging staff. Source: https://www.washingtonpost.com/sports/2026/04/16/f... |
| 4/12/26 | Three starts in, Nationals’ Foster Griffin continues to vex opponents. The left-hander signed out of Japan threw 5 1/3 scoreless innings in a 3-1 win over the Brewers. Source: https://www.washingtonpost.com/sports/2026/04/11/n... |
| 4/11/26 | Three starts in, Nationals’ Foster Griffin continues to vex opponents. The left-hander signed out of Japan threw 5 1/3 scoreless innings in a 3-1 win over the Brewers. Source: https://www.washingtonpost.com/sports/2026/04/11/n... |
| 3/31/26 | Nationals blow out Phillies to keep their hot start going. Everyone in Washington’s lineup had at least one hit, and Foster Griffin impressed in his first MLB action since 2022. Source: https://www.washingtonpost.com/sports/2026/03/30/n... |
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