2026 Stats
W-L
3-3
ERA
3.62
WHIP
1.15
K
36
SV
22
Rest-of-Season Projections
2026 Fantasy Outlook
O'Brien opened 2025 in the minors, striking out 32 in 19.1 innings at Triple-A Memphis before he was recalled for his first extended look in the majors. The 30-year-old completed a career-high 48.0 innings for St. Louis, tossing his 98 mph sinker nearly half of the time to suppress hard contact and produce a 54 percent ground ball rate. He didn't strike many batters out and walked more than you'd like to see - his 11.6 K-BB percentage ranked 137th out of the 191 relievers who threw 40-plus innings last year - but the Cardinals' flurry of relief pitcher trades opened up high-leverage opportunities for O'Brien. The right-hander closed out 2025 by racking up four of the last five saves for St. Louis. That puts him in the mix for early 2026 save opportunities, particularly if he throws more curveballs (21 percent pitch usage). O'Brien's curve held opposing hitters to a .059 BA (3rd for that pitch type among those who threw 100+ curveballs) and produced a 50.9 percent whiff rate (4th). Read Past Outlooks
Signed a one-year contract with the Cardinals in March of 2026.
Nails down league-leading 22nd save
O'Brien secured the save Saturday against the Cubs, allowing no runs on no hits and one walk in the ninth inning. He struck out one.
Analysis
That makes it nine straight successful conversions in save situations for O'Brien, who's been pretty reliable as the St. Louis closer. Through 36.1 innings, the 31-year-old right-hander has a 3.72 ERA, 1.16 WHIP and 35:12 K:BB with 22 saves in 26 opportunities. O'Brien now stands alone atop the National League in saves after entering Saturday in a three-way tie with Jhoan Duran and Mason Miller.
That makes it nine straight successful conversions in save situations for O'Brien, who's been pretty reliable as the St. Louis closer. Through 36.1 innings, the 31-year-old right-hander has a 3.72 ERA, 1.16 WHIP and 35:12 K:BB with 22 saves in 26 opportunities. O'Brien now stands alone atop the National League in saves after entering Saturday in a three-way tie with Jhoan Duran and Mason Miller.
Pitching Stats
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2026 MLB Game Log
2026
2025
2024
2022
2021
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
16
Last 10 Games
16
Last 5 Games
14
How many pitches does Riley O'Brien generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Riley O'Brien generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2024
-3%
BAA vs LHP
2026
-19%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2024vs Left | .223 | 46 | 20 | 35 | 2 | |||
| Since 2024vs Right | .230 | 46 | 22 | 42 | 4 | |||
| 2026vs Left | .250 | 15 | 7 | 18 | 1 | |||
| 2026vs Right | .203 | 21 | 5 | 13 | 1 | |||
| 2025vs Left | .157 | 27 | 9 | 11 | 0 | |||
| 2025vs Right | .224 | 18 | 13 | 22 | 2 | |||
| 2024vs Left | .400 | 4 | 4 | 6 | 1 | |||
| 2024vs Right | .333 | 7 | 4 | 7 | 1 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2024
-54%
ERA at Home
2026
-36%
ERA on Road
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2024Home | 2.28 | 1.11 | 51.1 | 7.0 | 2.8 | ||||
| Since 2024Away | 4.93 | 1.48 | 42.0 | 11.1 | 5.6 | ||||
| 2026Home | 4.29 | 1.38 | 21.0 | 7.3 | 2.6 | ||||
| 2026Away | 2.76 | 0.86 | 16.1 | 10.5 | 3.3 | ||||
| 2025Home | 0.66 | 0.88 | 27.1 | 6.9 | 2.6 | ||||
| 2025Away | 3.92 | 1.50 | 20.2 | 10.5 | 6.1 | ||||
| 2024Home | 3.00 | 1.33 | 3.0 | 6.0 | 6.0 | ||||
| 2024Away | 16.20 | 3.40 | 5.0 | 16.2 | 10.8 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Riley O'Brien compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
3.00K/9
8.7BB/9
2.9HR/9
0.5Fastball
98.3 mphERA
3.62WHIP
1.15BABIP
.295GB/FB
2.95Left On Base
64.7%Exit Velocity
82.0 mphBarrels/BBE
5.6%Spin Rate
2263 rpmBalls Hit 95+ MPH
27.1%Swinging Strike
11.3%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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More Fantasy News
Grabs 21st save
O'Brien earned the save Tuesday against Atlanta, allowing one hit in a scoreless ninth inning.
Analysis
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Secures 20th save
O'Brien picked up the save in Sunday's 2-1 win over Miami. He allowed no hits or walks with a strikeout over one inning.
Analysis
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Secures 19th save
O'Brien picked up the save in Monday's 3-2 victory over the Diamondbacks. He did not record a strikeout during a perfect ninth inning.
Analysis
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Records 18th save
O'Brien earned the save Tuesday against the Padres after tossing a scoreless ninth inning while allowing a walk.
Analysis
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Holds on for 17th save
O'Brien secured the save Sunday against the Reds, allowing no runs on one hit and no walks in the ninth inning. He struck out one.
Analysis
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Latest Fantasy Rumors
Late addition to NL All-Star roster
O'Brien was named to the NL All-Star roster for the 2026 MLB All-Star Game as the replacement for Paul Skenes on Tuesday.
Analysis
O'Brien was one of three late additions to the NL All-Star roster on Tuesday, as Jesus Luzardo and Braxton Ashcroft were also added to replace Max Meyer and Jacob Misiorowski, respectively. O'Brien's 3.72 ERA isn't very impressive, but he's been a key reliever for the Cardinals and has racked up 26 saves already.
O'Brien was one of three late additions to the NL All-Star roster on Tuesday, as Jesus Luzardo and Braxton Ashcroft were also added to replace Max Meyer and Jacob Misiorowski, respectively. O'Brien's 3.72 ERA isn't very impressive, but he's been a key reliever for the Cardinals and has racked up 26 saves already.