Riley O'Brien| 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 | 1 | 13 | 1 | 22.0 | 18 | 2 | 25 | 6 | 2.45 | 0.909 | 101.4 |
| 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 |
| 4/26/26 | Riley O’Brien, grandson of Seattle icon, having breakthrough season for St. Louis Cardinals. Riley O'Brien, a Shorewood High alum and the grandson of Seattle sports legend Johnny O'Brien, is having a breakthrough season as the closer for the St. Louis Cardinals. Source: https://www.seattletimes.com/sports/mariners/riley... |
| 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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