Riley O'Brien
St. Louis CardinalsPSince 2021Season Percentiles
K63
76th
W5
80th
SV21
99th
ERA2.77
84th
WHIP1.25
73th
IP55.2
76th
Game Logs
| June 2026 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Jun 7, 2026 | vs CIN | SV | 1 | 1 | 0 | 1 | 0 | 0 | 0.00 | 1.00 | 89 |
| Jun 6, 2026 | vs CIN | SV | 1 | 2 | 0 | 1 | 1 | 0 | 0.00 | 3.00 | 87 |
| Jun 3, 2026 | vs TEX | SV | 1 | 0 | 0 | 0 | 1 | 0 | 0.00 | 1.00 | 86 |
| Jun 2, 2026 | vs TEX | L | 1 | 3 | 3 | 2 | 1 | 0 | 27.00 | 4.00 | 6 |
| June 2026 | — | — | 4.0 | 6 | 3 | 4 | 3 | 0 | — | — | — |
| May 2026 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| May 29, 2026 | vs CHC | SV | 1 | 1 | 1 | 0 | 0 | 0 | 9.00 | 1.00 | 82 |
| May 23, 2026 | @ CIN | L | 1.1 | 0 | 0 | 2 | 1 | 0 | 0.00 | 0.75 | 69 |
| May 19, 2026 | vs PIT | — | 1 | 2 | 2 | 0 | 1 | 0 | 18.00 | 3.00 | 9 |
| May 15, 2026 | vs KC | — | 1 | 1 | 0 | 0 | 0 | 0 | 0.00 | 1.00 | 36 |
| May 14, 2026 | @ ATH | SV | 1 | 0 | 0 | 2 | 0 | 0 | 0.00 | 0.00 | 92 |
| May 10, 2026 | @ SD | — | 1 | 2 | 2 | 3 | 0 | 1 | 18.00 | 2.00 | 16 |
| May 8, 2026 | @ SD | SV | 1 | 0 | 0 | 1 | 0 | 0 | 0.00 | 0.00 | 90 |
| May 4, 2026 | vs MIL | SV | 0.2 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0.00 | 86 |
| May 2026 | — | — | 7.3 | 6 | 5 | 8 | 2 | 1 | — | — | — |
| April 2026 | |||||||||||
| Date | OPP | Dec | IP | H | ER | K | BB | HR | ERA | WHIP | wZRD |
| Apr 29, 2026 | @ PIT | SV | 1 | 1 | 0 | 1 | 0 | 0 | 0.00 | 1.00 | 89 |
| Apr 25, 2026 | vs SEA | L | 1 | 4 | 2 | 1 | 1 | 0 | 18.00 | 5.00 | 9 |
| Apr 21, 2026 | @ MIA | SV | 1 | 1 | 0 | 1 | 0 | 0 | 0.00 | 1.00 | 89 |
| Apr 19, 2026 | @ HOU | W | 1.1 | 1 | 0 | 2 | 0 | 0 | 0.00 | 0.75 | 91 |
| Apr 18, 2026 | @ HOU | SV | 0.2 | 0 | 0 | 1 | 0 | 0 | 0.00 | 0.00 | 88 |
| Apr 15, 2026 | vs CLE | SV | 1 | 0 | 0 | 2 | 0 | 0 | 0.00 | 0.00 | 92 |
| Apr 11, 2026 | vs BOS | SV | 1 | 0 | 0 | 1 | 0 | 0 | 0.00 | 0.00 | 90 |
| 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 | — | — | 10.3 | 8 | 2 | 14 | 1 | 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 | 33 |
| Mar 26, 2026 | vs TB | W | 1.1 | 1 | 0 | 2 | 0 | 0 | 0.00 | 0.75 | 91 |
| March 2026 | — | — | 3.1 | 3 | 0 | 2 | 0 | 0 | — | — | — |
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