Riley O'Brien stats
CardinalsRelief Pitcher · #61
Bio
- Age
- 31 yearsFeb 6, 1995
- Height
- 6' 4"
- Weight
- 180 lbs
- Experience
- 5 yearsDebut 2021
- Birthplace
- Seattle, WA
- Draft
- 2017Rd 8, Pk 229
- College
- College of Idaho
Bio
- Age
- 31 yearsFeb 6, 1995
- Height
- 6' 4"
- Weight
- 180 lbs
- Experience
- 5 yearsDebut 2021
- Birthplace
- Seattle, WA
- Draft
- 2017Rd 8, Pk 229
- College
- College of Idaho
Stats
Standard
Cardinals- GP
- 66
- W
- 3
- L
- 9
- ERA
- 4.08
- IP
- 64.0
- K
- 64
- BB
- 29
- WHIP
- 1.28
Career regular season
- GP
- 118
- W
- 6
- L
- 11
- ERA
- 3.83
- IP
- 122.1
- K
- 123
- BB
- 63
- WHIP
- 1.35
Latest performance
Riley O'Brien
Sep 20 · vs WSH · W 5-3
- IP
- 1.0
- H
- 0
- R
- 0
- ER
- 0
- BB
- 0
- K
- 0
- HR
- 0
- ERA
- 4.08
Games
All gamesNext
at PITTue, Sep 22
vs PIT since 2025
- 5
- GP
- 4.4
- IP
- 6
- H
- 4
- R
- 4
- ER
- 3
- K
| Date | Opponent | IP | H | R | ER | K |
|---|---|---|---|---|---|---|
| Sun, Sep 20 | vs WSHW 5-3 | 1 | 0 | 0 | 0 | 0 |
| Sat, Sep 19 | vsWSHL 8-5 F/11 | 1 | 1 | 1 | 0 | 2 |
| Wed, Sep 16 | vs SFL 6-5 F/10 | 1 | 2 | 2 | 1 | 0 |
| Mon, Sep 14 | vsSFW 2-1 | 1 | 1 | 0 | 0 | 2 |
| Sat, Sep 12 | vs CHWL 6-5 | 1 | 1 | 2 | 2 | 2 |
| Fri, Sep 11 | vsCHWW 7-3 | 1 | 0 | 0 | 0 | 1 |
What are Riley O'Brien's career stats?
Riley O'Brien has played 5 seasons for the Reds, the Mariners and the Cardinals. He has 6 wins and 123 strikeouts with a 3.83 ERA over 122.1 innings. His best season so far is 2025: 3 wins, a 2.06 ERA and 45 strikeouts.
Best single games
- Strikeouts (Pitching): 4 vs ATL on Jul 11, 2025, L 6-5
Regular season only, from MLB game logs since 2021.
League leaderboards and awards
5 seasons, 2021 to 2026
Riley O'Brien finished top 10 in a stat 1 time.
Season top 10 finishes
Among qualified MLB players each season, as the glossary defines each stat. All-time places are among players on file.
More on Riley O'Brien
Riley O'Brien against each club
- vs Chicago Cubs (11)
- vs Cincinnati Reds (10)
- vs Milwaukee Brewers (9)
- vs San Francisco Giants (7)
- vs Los Angeles Dodgers (6)
- vs San Diego Padres (6)
- vs Atlanta Braves (5)
- vs Colorado Rockies (5)
- vs Pittsburgh Pirates (5)
- vs Chicago White Sox (4)
- vs Miami Marlins (4)
- vs New York Yankees (4)
- vs Seattle Mariners (4)
- vs Toronto Blue Jays (4)
- vs Washington Nationals (4)
- vs Arizona Diamondbacks (3)
- vs Cleveland Guardians (3)
- vs Kansas City Royals (3)
- vs Tampa Bay Rays (3)
- vs Athletics (2)
- vs Baltimore Orioles (2)
- vs Houston Astros (2)
- vs Los Angeles Angels (2)
- vs New York Mets (2)
- vs Philadelphia Phillies (2)
- vs Texas Rangers (2)
- vs Boston Red Sox (1)
- vs Detroit Tigers (1)
- vs Minnesota Twins (1)
Similar players
Closest career per-game profiles to Riley O'Brien among MLB players at the same position.
- Camilo DovalPITAlike in Saves74out of 100 on profile similarity
- Jordan RomanoCOLAlike in Saves70out of 100 on profile similarity
- Kyle FinneganDETAlike in Innings pitched, WHIP69out of 100 on profile similarity
- John AxfordAlike in Innings pitched, ERA67out of 100 on profile similarity
- Alex ColomeAlike in Saves66out of 100 on profile similarity
Compare Riley O'Brien with Camilo Doval, Jordan Romano, Kyle Finnegan