| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 3 | 3 | 11 | 8 | 57.0 | 51 | 25 | 58 | 24 | 3.79 | 1.333 | 22.7 |
| 2026 | 3 | 0 | 6 | 1 | 12.3 | 5 | 0 | 14 | 0 | 0.00 | 0.405 | 141.3 |
| 2025 | 3 | 1 | 6 | 6 | 48.0 | 33 | 22 | 45 | 11 | 2.06 | 1.146 | 36.4 |
| 2024 | 0 | 0 | 0 | 0 | 8.0 | 13 | 8 | 11 | 10 | 11.25 | 2.625 | -10.7 |
| Date | News |
| 4/15/26 | Closer stock watch: Riley O'Brien thriving in St. Louis. Everything fantasy baseball managers need to know about which closers should be added, dropped and more. Source: https://www.espn.com/fantasy/baseball/story/_/id/4... |
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