2025 Stats
W-L
0-0
ERA
2.70
WHIP
1.26
K
14
SV
0
Rest-of-Season Projections
Signed a one-year contract with the Cardinals in March of 2025.
Back with big club
The Cardinals recalled O'Brien from Triple-A Memphis on Monday.
Analysis
O'Brien was sent down to Triple-A on Saturday but is back with the Cardinals ahead of their series opener against Toronto. O'Brien boasts a 6.23 ERA and 3:2 K:BB across 4.1 innings of work out of the St. Louis bullpen this season.
O'Brien was sent down to Triple-A on Saturday but is back with the Cardinals ahead of their series opener against Toronto. O'Brien boasts a 6.23 ERA and 3:2 K:BB across 4.1 innings of work out of the St. Louis bullpen this season.
Pitching Stats
Loading Pitching Stats...
2025 MLB Game Log
2025
2024
2022
2021
Minor League Game Log
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Pitching Appearances Breakdown
Average Pitch Count
19
Last 10 Games
20
Last 5 Games
19
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 2023
-12%
BAA vs LHP
2025
-44%
BAA vs LHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .257 | 13 | 7 | 9 | 1 | |||
| Since 2023vs Right | .293 | 12 | 9 | 17 | 3 | |||
| 2025vs Left | .150 | 9 | 3 | 3 | 0 | |||
| 2025vs Right | .270 | 5 | 5 | 10 | 2 | |||
| 2024vs Left | .400 | 4 | 4 | 6 | 1 | |||
| 2024vs Right | .333 | 7 | 4 | 7 | 1 | |||
| 2023vs Left | 0 | 0 | 0 | 0 | 0 | |||
| 2023vs Right | 0 | 0 | 0 | 0 | 0 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
-83%
ERA at Home
2025
-77%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 1.54 | 1.20 | 11.2 | 5.4 | 3.9 | ||||
| Since 2023Away | 9.00 | 2.15 | 13.0 | 12.5 | 7.6 | ||||
| 2025Home | 1.04 | 1.15 | 8.2 | 5.2 | 3.1 | ||||
| 2025Away | 4.50 | 1.38 | 8.0 | 10.1 | 5.6 | ||||
| 2024Home | 3.00 | 1.33 | 3.0 | 6.0 | 6.0 | ||||
| 2024Away | 16.20 | 3.40 | 5.0 | 16.2 | 10.8 | ||||
| 2023Home | 0 | 0 | 0 | 0 | 0 | ||||
| 2023Away | 0 | 0 | 0 | 0 | 0 | ||||
| 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
1.75K/9
7.6BB/9
4.3HR/9
1.1Fastball
97.9 mphERA
2.70WHIP
1.26BABIP
.250GB/FB
2.44Left On Base
87.9%Exit Velocity
82.5 mphBarrels/BBE
3.3%Spin Rate
2279 rpmBalls Hit 95+ MPH
26.7%Swinging Strike
9.9%Advanced Pitching Stats
Loading Advanced Pitching Stats...
Defensive Stats
Loading MLB Defensive Stats...
Stats Vs Today's Lineup
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
More Fantasy News
Back to minors after doubleheader
The Cardinals optioned O'Brien to Triple-A Memphis on Friday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Up as 27th man for doubleheader
The Cardinals recalled O'Brien from Triple-A Memphis on Thursday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Optioned to Triple-A
The Cardinals optioned O'Brien to Triple-A Memphis on Friday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Brought up from minors
The Cardinals recalled O'Brien from Triple-A Memphis on Friday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Optioned to Triple-A
The Cardinals optioned O'Brien to Triple-A Memphis on Saturday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Latest Fantasy Rumors
Eligible for promotion Monday
O'Brien will be eligible to be recalled by the Cardinals on Monday, and Jeff Jones of the Belleville News-Democrat speculates the right-hander could be called up from Triple-A Memphis at some point this week.
Analysis
O'Brien could have joined the Cardinals over the past couple weeks if the corresponding move was an IL transaction, but he's stayed a Triple-A for the full 15 days. The 29-year-old has made just one appearance in the majors this season but has been dominant in 13 outings for Memphis with a 1.46 ERA, 0.99 WHIP and 9:5 K:BB over 12.1 innings.
O'Brien could have joined the Cardinals over the past couple weeks if the corresponding move was an IL transaction, but he's stayed a Triple-A for the full 15 days. The 29-year-old has made just one appearance in the majors this season but has been dominant in 13 outings for Memphis with a 1.46 ERA, 0.99 WHIP and 9:5 K:BB over 12.1 innings.