Riley O'Brien
St. Louis CardinalsPSince 2021Season Percentiles
K42
72th
W4
80th
SV9
97th
ERA1.68
91th
WHIP1.17
77th
IP37.6
71th
Game Logs
| April 2026 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Apr 8, 2026 | @ WAS | — | 1 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0.00 | 41 |
| Apr 7, 2026 | @ WAS | SV | 1 | 0 | 0 | 2 | 0 | 0 | 0.00 | 0.00 | 92 |
| Apr 5, 2026 | @ DET | SV | 1 | 0 | 0 | 1 | 0 | 0 | 0.00 | 0.00 | 90 |
| Apr 1, 2026 | vs NYM | — | 1 | 1 | 0 | 2 | 0 | 0 | 0.00 | 1.00 | 63 |
| April 2026 | — | — | 4.0 | 1 | 0 | 5 | 0 | 0 | — | — | — |
| March 2026 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Mar 31, 2026 | vs NYM | SV | 1 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0.00 | 87 |
| Mar 28, 2026 | vs TB | — | 1 | 2 | 0 | 0 | 0 | 0 | 0.00 | 2.00 | 32 |
| Mar 26, 2026 | vs TB | W | 1.1 | 1 | 0 | 2 | 0 | 0 | 0.00 | 0.91 | 91 |
| March 2026 | — | — | 3.1 | 3 | 0 | 2 | 0 | 0 | — | — | — |
| September 2025 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Sep 28, 2025 | @ CHC | — | 1 | 1 | 0 | 2 | 0 | 0 | 2.06 | 1.00 | — |
| Sep 25, 2025 | @ SF | L | 1 | 2 | 1 | 0 | 1 | 0 | 2.11 | 3.00 | — |
| Sep 24, 2025 | @ SF | SV | 0.1 | 0 | 0 | 1 | 0 | 0 | 1.96 | 0.00 | — |
| Sep 21, 2025 | @ STL | — | 1 | 0 | 0 | 0 | 0 | 0 | 1.97 | 0.00 | — |
| Sep 20, 2025 | vs MIL | — | 1.1 | 0 | 0 | 1 | 1 | 0 | 2.01 | 0.91 | 60 |
| Sep 16, 2025 | vs CIN | SV | 1 | 0 | 0 | 1 | 0 | 0 | 2.08 | 0.00 | 90 |
| Sep 14, 2025 | @ MIL | SV | 1 | 0 | 0 | 2 | 1 | 0 | 2.13 | 1.00 | 92 |
| Sep 14, 2025 | @ MIL | — | 0 | 2 | 3 | 0 | 0 | 0 | 2.18 | — | 25 |
| Sep 11, 2025 | @ SEA | — | 2 | 2 | 0 | 2 | 2 | 0 | 1.52 | 2.00 | 69 |
| Sep 7, 2025 | vs SF | SV | 1 | 1 | 0 | 0 | 0 | 0 | 1.60 | 1.00 | 86 |
| Sep 6, 2025 | vs SF | W | 1 | 0 | 0 | 1 | 0 | 0 | 1.64 | 0.00 | 87 |
| September 2025 | — | — | 10.2 | 8 | 4 | 10 | 5 | 0 | — | — | — |
| August 2025 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Aug 28, 2025 | @ STL | — | 1 | 0 | 0 | 0 | 0 | 0 | 1.69 | 0.00 | — |
| Aug 25, 2025 | @ STL | W | 1.2 | 1 | 1 | 1 | 0 | 0 | 1.73 | 0.83 | — |
| Aug 19, 2025 | @ MIA | SV | 1 | 0 | 0 | 2 | 2 | 0 | 1.56 | 2.00 | — |
| Aug 17, 2025 | @ STL | — | 1.2 | 1 | 0 | 2 | 0 | 0 | 1.60 | 0.83 | — |
| Aug 13, 2025 | @ STL | — | 1 | 2 | 0 | 0 | 0 | 0 | 1.69 | 2.00 | — |
| Aug 10, 2025 | @ STL | — | 0.2 | 0 | 0 | 1 | 1 | 0 | 1.74 | 5.00 | — |
| Aug 9, 2025 | @ STL | — | 1 | 0 | 0 | 0 | 0 | 0 | 1.78 | 0.00 | — |
| Aug 6, 2025 | @ LA | SV | 1.1 | 0 | 0 | 0 | 1 | 0 | 1.84 | 0.91 | — |
| Aug 5, 2025 | @ LA | W | 1 | 1 | 1 | 0 | 0 | 0 | 1.93 | 1.00 | 82 |
| August 2025 | — | — | 8.7 | 5 | 2 | 6 | 4 | 0 | — | — | — |
| July 2025 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Jul 30, 2025 | vs MIA | — | 1.1 | 0 | 0 | 1 | 0 | 0 | 1.67 | 0.00 | 62 |
| Jul 26, 2025 | vs SD | — | 1 | 0 | 0 | 1 | 0 | 0 | 1.75 | 0.00 | 54 |
| Jul 24, 2025 | vs SD | — | 0.1 | 1 | 0 | 1 | 1 | 0 | 1.82 | 20.00 | 32 |
| Jul 23, 2025 | @ COL | — | 1 | 1 | 0 | 1 | 2 | 0 | 1.85 | 3.00 | 39 |
| Jul 20, 2025 | @ ARI | — | 1 | 0 | 0 | 2 | 0 | 0 | 1.93 | 0.00 | 66 |
| Jul 13, 2025 | vs ATL | — | 1.2 | 1 | 0 | 2 | 1 | 0 | 2.01 | 1.67 | 70 |
| Jul 12, 2025 | vs ATL | — | 2 | 2 | 0 | 4 | 1 | 0 | 2.18 | 1.50 | 77 |
| Jul 6, 2025 | @ CHC | — | 2 | 2 | 0 | 3 | 0 | 0 | 2.41 | 1.00 | 76 |
| Jul 2, 2025 | @ PIT | — | 0.2 | 2 | 1 | 1 | 1 | 0 | 2.70 | 15.00 | 17 |
| July 2025 | — | — | 9.6 | 9 | 1 | 16 | 6 | 0 | — | — | — |
| June 2025 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Jun 29, 2025 | @ CLE | — | 1 | 0 | 0 | 3 | 2 | 0 | 2.25 | 2.00 | 70 |
| Jun 23, 2025 | vs CHC | — | 1 | 1 | 0 | 0 | 0 | 0 | 2.57 | 1.00 | 35 |
| June 2025 | — | — | 2.0 | 1 | 0 | 3 | 2 | 0 | — | — | — |
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