← St. Louis Cardinals
Riley O'Brien
St. Louis Cardinals
RP · #61 · Bats R · Throws R · 6'4" · 180 lb · Age 31 · 5 yrs in MLB
2026 grade
53.9
- Runs prevented
- +2.4
- IP · ERA
- 64.0 · 4.08
- K · BB
- 64 · 29
- Rank
- 95 of 205 relievers
What the grade is made of
Runs each part saves or costs against an average pitcher facing the same batters. Contact counts a quarter for how it turned out, because over a season that's mostly the fielders and luck.
- Home runs allowed5 vs 8 avg+4.5
- Hit batters10 vs 3 avg−2.4
- Strikeouts64 vs 60 avg+1.1
- Walks25 vs 23 avg−0.6
- Contact allowed (how it turned out counts a quarter)165 vs 174 avg−0.2
2026 game log: pitching
Game grades need 3 batters faced; starts are ranked against starts, relief outings against relief outings.
| Game | Result | Dec | IP | H | R | ER | BB | K | HR | PC | Grade |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sun, Sep 20vsWSH | W 5-3 | S | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 78.5 |
| Sat, Sep 19vsWSH | L 5-8 | 1.0 | 1 | 1 | 0 | 0 | 2 | 0 | 12 | 56.3 | |
| Wed, Sep 16vsSF | L 5-6 | L | 1.0 | 2 | 2 | 1 | 1 | 0 | 1 | 16 | 5.7 |
| Mon, Sep 14vsSF | W 2-1 | S | 1.0 | 1 | 0 | 0 | 1 | 2 | 0 | 19 | 39.3 |
| Sat, Sep 12vsCHW | L 5-6 | L | 1.0 | 1 | 2 | 2 | 1 | 2 | 1 | 21 | 15.0 |
| Fri, Sep 11vsCHW | W 7-3 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 11 | 77.9 | |
| Mon, Sep 7@SF | L 4-5 | B | 1.0 | 1 | 1 | 0 | 2 | 0 | 0 | 11 | 33.7 |
| Fri, Sep 4@COL | W 7-6 | S | 1.0 | 1 | 0 | 0 | 0 | 2 | 0 | 12 | 60.6 |
| Thu, Sep 3@LAD | L 2-3 | L | 0.1 | 2 | 2 | 2 | 1 | 0 | 0 | 17 | 9.7 |
| Wed, Sep 2@LAD | W 8-6 | S | 1.0 | 0 | 1 | 0 | 0 | 1 | 0 | 17 | 75.5 |
| Thu, Aug 27vsBAL | W 7-5 | S | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 11 | 55.9 |
| Wed, Aug 26vsBAL | L 7-8 | L | 1.0 | 2 | 1 | 1 | 0 | 0 | 0 | 17 | 26.5 |
| Sun, Aug 23@PHI | L 4-6 | L | 0.2 | 5 | 6 | 6 | 1 | 0 | 1 | 39 | 0.4 |
| Thu, Aug 20@CIN | W 10-9 | S | 0.1 | 1 | 0 | 0 | 2 | 0 | 0 | 15 | 16.5 |
| Tue, Aug 18@CIN | W 3-0 | S | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 13 | 85.0 |
| Mon, Aug 17@CIN | W 2-1 | S | 1.0 | 0 | 0 | 0 | 0 | 3 | 0 | 14 | 85.0 |
| Sat, Aug 15@CHC | W 8-4 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 72.3 | |
| Tue, Aug 11vsPHI | W 2-0 | S | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 8 | 77.9 |
| Sun, Aug 9vsCOL | W 7-4 | S | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 78.5 |
| Fri, Aug 7vsCOL | W 3-2 | S | 1.0 | 0 | 0 | 0 | 1 | 0 | 0 | 14 | 50.3 |
| Wed, Aug 5@NYY | W 3-1 | S | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 22 | 63.5 |
| Sun, Aug 2@TOR | W 5-1 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 18 | 57.1 | |
| Thu, Jul 30vsCHC | L 2-4 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 17 | 79.1 | |
| Wed, Jul 29vsCHC | W 3-2 | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 18 | 61.4 | |
| Wed, Jul 22@LAA | W 1-0 | S | 1.0 | 0 | 0 | 0 | 2 | 3 | 0 | 26 | 48.3 |
| Mon, Jul 20@LAA | L 2-3 | L | 0.1 | 2 | 2 | 2 | 1 | 1 | 0 | 21 | 5.8 |
| Fri, Jul 17@ARI | W 5-4 | S | 1.0 | 1 | 0 | 0 | 1 | 1 | 0 | 16 | 23.9 |
| Sat, Jul 11vsATL | W 4-1 | S | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 18 | 47.1 |
| Fri, Jul 10vsATL | W 2-1 | S | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 12 | 81.8 |
| Wed, Jul 8vsMIL | W 5-1 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 15 | 57.1 | |
| Sat, Jul 4@CHC | W 3-0 | S | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 13 | 49.6 |
| Tue, Jun 30@ATL | W 5-3 | S | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 9 | 42.3 |
| Sun, Jun 28vsMIA | W 2-1 | S | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 15 | 77.9 |
| Mon, Jun 22vsARI | W 3-2 | S | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 17 | 78.5 |
| Sun, Jun 21@KC | W 12-10 | 1.0 | 2 | 2 | 2 | 0 | 1 | 1 | 12 | 8.1 | |
| Tue, Jun 16vsSD | W 3-2 | S | 1.0 | 0 | 0 | 0 | 1 | 0 | 0 | 13 | 63.5 |
| Sat, Jun 13@MIN | W 9-6 | 1.0 | 0 | 1 | 1 | 3 | 1 | 0 | 31 | 34.4 | |
| Sun, Jun 7vsCIN | W 5-3 | S | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 15 | 41.3 |
| Sat, Jun 6vsCIN | W 6-5 | S | 1.0 | 2 | 0 | 0 | 1 | 1 | 0 | 23 | 25.2 |
| Wed, Jun 3vsTEX | W 5-3 | S | 1.0 | 0 | 0 | 0 | 1 | 0 | 0 | 13 | 62.4 |
| Tue, Jun 2vsTEX | L 4-7 | L | 1.0 | 3 | 3 | 3 | 1 | 2 | 0 | 32 | 14.2 |
| Fri, May 29vsCHC | W 6-5 | S | 1.0 | 1 | 1 | 1 | 0 | 0 | 0 | 14 | 41.0 |
| Sat, May 23@CIN | L 6-7 | L | 1.1 | 0 | 1 | 0 | 1 | 2 | 0 | 20 | 69.9 |
| Tue, May 19vsPIT | W 9-6 | B | 1.0 | 2 | 2 | 2 | 1 | 0 | 0 | 22 | 7.2 |
| Fri, May 15vsKC | W 5-4 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 10 | 42.9 | |
| Thu, May 14@ATH | W 5-4 | S | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 16 | 61.5 |
| Tue, May 12@ATH | W 6-4 | S | 1.0 | 0 | 0 | 0 | 1 | 0 | 0 | 13 | 50.7 |
| Sun, May 10@SD | L 2-3 | B | 1.0 | 2 | 2 | 2 | 0 | 3 | 1 | 31 | 11.9 |
| Thu, May 7@SD | W 2-1 | S | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 10 | 72.8 |
| Mon, May 4vsMIL | W 6-3 | S | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | – |
| Sat, May 2vsLAD | W 3-2 | S | 1.0 | 4 | 2 | 2 | 0 | 2 | 0 | 26 | 11.9 |
| Wed, Apr 29@PIT | W 5-4 | S | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 11 | 57.8 |
| Sat, Apr 25vsSEA | L 9-11 | L | 1.0 | 4 | 2 | 2 | 1 | 1 | 0 | 39 | 4.9 |
| Tue, Apr 21@MIA | W 5-3 | S | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 17 | 57.2 |
| Sun, Apr 19@HOU | W 7-5 | W | 1.1 | 1 | 0 | 0 | 0 | 2 | 0 | 19 | 54.1 |
| Sat, Apr 18@HOU | W 7-5 | S | 0.2 | 0 | 0 | 0 | 0 | 1 | 0 | 7 | – |
| Wed, Apr 15vsCLE | W 5-3 | S | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 15 | 78.2 |
| Tue, Apr 14vsCLE | W 6-5 | W | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 15 | 78.2 |
| Fri, Apr 10vsBOS | W 3-2 | S | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 8 | 78.2 |
| Wed, Apr 8@WSH | W 6-1 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 82.5 | |
| Tue, Apr 7@WSH | W 7-6 | S | 1.0 | 0 | 1 | 0 | 0 | 2 | 0 | 16 | 61.5 |
| Sun, Apr 5@DET | W 5-3 | S | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 13 | 87.9 |
| Wed, Apr 1vsNYM | W 2-1 | 1.0 | 1 | 0 | 0 | 0 | 2 | 0 | 16 | 41.9 | |
| Tue, Mar 31vsNYM | W 3-0 | S | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 78.2 |
| Sat, Mar 28vsTB | W 6-5 | H | 1.0 | 2 | 0 | 0 | 0 | 0 | 0 | 9 | 27.5 |
| Thu, Mar 26vsTB | W 9-7 | W | 1.1 | 1 | 0 | 0 | 0 | 2 | 0 | 17 | 67.9 |
2026 game log: hitting
Game grades need 3 plate appearances.
Scores, box scores and play-by-play from ESPN. The run values and park factors behind the grades were worked out from Retrosheet's play-by-play: the information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.