Riley O'Brien stats

Cardinals

Relief Pitcher · #61

Age 31 · 6' 4" · 180 lbs

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Riley O'Brien recorded 3 wins, a 4.08 ERA and 64 strikeouts in 66 games of 2026 for the St. Louis Cardinals. Last game: .

Stats

Choose how these numbers are shown

Standard

GP
66
W
3
L
9
ERA
4.08
IP
64.0
K
64
BB
29
WHIP
1.28
Standard by season
GP: Games the player appeared in, however briefly.W: Games in which this pitcher was credited with the win.L: Games in which this pitcher was charged with the loss.ERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent.IP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs.K: Batters this pitcher struck out.BB: Times the batter reached first base on four balls.WHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite.
2021CIN10113.501.1233.75
2022SEA1000.001.0112.00
2024STL800, led the MLB11.258.01182.63
2025STL42312.0648.045221.15
2026STL66394.0864.064291.28

What the columns mean: W · L · ERA · IP · K · BB · WHIP

Bold marks the best figure in the MLB that season, among players with at least 30 games.

Career regular season

GP
118
W
6
L
11
ERA
3.83
IP
122.1
K
123
BB
63
WHIP
1.35

Expanded

QS
0
CG
0
SHO
0
K/9
9.0
GB
82
FB
91
G/F
0.90
WP
7
Expanded by season
QS: Quality starts: six innings or more with no more than three earned runs.CG: Complete games, pitched from the first out to the last.SHO: Shutouts — complete games with no run allowed.K/9: Strikeouts for every nine innings pitched.GB: Ground balls hit against this pitcher.FB: Fly balls hit against this pitcher.G/F: Ground balls for every fly ball hit against this pitcher.WP: Wild pitches — throws the catcher had no chance to stop.
2021CIN00013.52210
2022SEA0009.03000
2024STL00012.410160.61
2025STL0008.469561.23
2026STL0009.082910.97

What the columns mean: QS · CG · SHO · K/9 · G/F · WP

Career regular season

QS
0
CG
0
SHO
0
K/9
9.0
GB
166
FB
165
G/F
1.00
WP
11

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

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 games
Most recent games
DateOpponentIPHRERK
Sun, Sep 20vsWSHW 5-310000
Sat, Sep 19vsWSHL 8-5 F/1111102
Wed, Sep 16vsSFL 6-5 F/1012210
Mon, Sep 14vsSFW 2-111002
Sat, Sep 12vsCHWL 6-511222
Fri, Sep 11vsCHWW 7-310001

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
Riley O'Brien's best game in each stat, by season
K: Batters this pitcher struck out.
20263
20254
20243
20221
20212

What the columns mean: K

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