Riley O'Brien

Riley O'Brien

29-Year-Old PitcherRP
St. Louis Cardinals
15-Day IL
Injury Forearm
Est. Return 5/17/2024
2024 Fantasy Outlook
There was no outlook written for Riley O'Brien in 2024. Check out the latest news below for more on his current fantasy value.
RANKSFrom Preseason
#601
ADP
$Traded to the Cardinals in November of 2023.
Close to starting throwing program
PSt. Louis Cardinals
Forearm
April 15, 2024
O'Brien (forearm) will begin a throwing program this week, Katie Woo of The Athletic reports.
ANALYSIS
An MRI on O'Brien's right forearm showed no structural damage, but the team decided to shut him down for a few weeks regardless. It sounds like O'Brien is about ready to begin ramping up his throwing, and provided he avoids any setbacks, a return in mid-to-late May seems plausible. O'Brien has made single appearances in the majors each of the past three seasons, all for different teams (Reds, Mariners, Cardinals).
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Pitching Stats
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2024
2022
2021
2024 MLB Game Log
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2022 MLB Game Log
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2021 MLB Game Log
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Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
28
Last 10 Games
28
Last 5 Games
28
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+
 
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+
 
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
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
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 2022
 
 
-40%
BAA vs LHP
2024
 
 
-100%
BAA vs RHP
2023
No Stats
2022
 
 
-100%
BAA vs LHP
BAA Batters K BB H 2B 3B HR
Since 2022vs Left .200 6 2 1 1 0 0 0
Since 2022vs Right .333 5 1 2 1 0 0 0
2024vs Left .500 3 1 1 1 0 0 0
2024vs Right .000 3 1 1 0 0 0 0
2023vs Left 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0
2022vs Left .000 3 1 0 0 0 0 0
2022vs Right 1.000 2 0 1 1 0 0 0
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2022
 
 
-100%
ERA at Home
2024
 
 
-100%
ERA at Home
2023
No Stats
2022
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2022Home 0.00 2.00 1.0 0 0 0 9.0 9.0 0.0
Since 2022Away 9.00 3.00 1.0 0 0 0 18.0 18.0 0.0
2024Home 0 0 0 0 0 0 0 0 0
2024Away 9.00 3.00 1.0 0 0 0 18.0 18.0 0.0
2023Home 0 0 0 0 0 0 0 0 0
2023Away 0 0 0 0 0 0 0 0 0
2022Home 0.00 2.00 1.0 0 0 0 9.0 9.0 0.0
2022Away 0 0 0 0 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.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
1.00
 
K/9
18.0
 
BB/9
18.0
 
HR/9
0.0
 
Fastball
96.0 mph
 
ERA
9.00
 
WHIP
3.00
 
BABIP
.549
 
GB/FB
0.00
 
Left On Base
66.7%
 
Swinging Strike
17.9%
 
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
Shut down from throwing
PSt. Louis Cardinals
Forearm
April 1, 2024
O'Brien (forearm) underwent an MRI on his right flexor tendon Monday, John Denton of MLB.com reports.
ANALYSIS
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Out with flexor strain
PSt. Louis Cardinals
Forearm
March 31, 2024
O'Brien was placed on the 15-day injured list Sunday with a flexor strain in his right forearm.
ANALYSIS
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Auditioning well in spring
PSt. Louis Cardinals
March 3, 2024
O'Brien has allowed three hits and struck out two without walking a batter over three scoreless innings in Grapefruit League play.
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Acquired by Cardinals
PSt. Louis Cardinals
November 6, 2023
The Cardinals acquired O'Brien from the Mariners on Monday in exchange for cash considerations and purchased his contract, Derrick Goold of the St. Louis Post-Dispatch reports.
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Outrighted to Triple-A
PSeattle Mariners
June 2, 2022
O'Brien cleared waivers and was outrighted to Triple-A Tacoma on Thursday.
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