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Riley O'Brien

RP  ·  St. Louis Cardinals  ·  #61

Bats/ThrowsR/R
Height6' 4"
Weight180 lbs
BirthplaceSeattle, WA
MLB Debut2021
Draft2017: Rd 8, Pk 229 (TB)

🪪Bio

Bats/ThrowsR/R
Height6' 4"
Weight180 lbs
BirthplaceSeattle, WA
MLB Debut2021
CollegeCollege of Idaho
Draft2017: Rd 8, Pk 229 (TB)

📊Season Stats (2026)

ERA4.03
W-L3-7
IP58.0
K57
WHIP1.28
SV36

Full Stat Line

G60
GS0
QS0
HLD1
H48
ER26
HR3
BB26
K/98.84
WAR0.10

🤚Career Splits by Handedness

vs Left-Handed Batters
AVG.256
OBP.381
SLG.360
OPS.741
106 PA  ·  Ranks #327 of 612 qualified pitchers
vs Right-Handed Batters
AVG.236
OBP.340
SLG.337
OPS.677
104 PA  ·  Ranks #258 of 630 qualified pitchers

Career totals from real plate-appearance data — lower OPS allowed is better for a pitcher.

⚔️This Season vs. Each Opponent

Opponent ERAIPKBBOpp AVG
vs. CIN 0.005.284.190
vs. CHC 1.805.032.067
vs. ATL 0.003.031.100
vs. COL 0.003.021.111
vs. SD 6.003.041.182
vs. LAD 15.432.131.462
vs. TB 0.002.120.333
vs. ARI 0.002.011.167
vs. BAL 4.502.010.333
vs. CLE 0.002.030.000
vs. HOU 0.002.030.167
vs. KC 9.002.010.375
vs. MIA 0.002.020.143
vs. NYM 0.002.020.143
vs. OAK 0.002.021.000
vs. PIT 9.002.011.375
vs. TEX 13.502.022.375
vs. WSH 0.002.020.000
vs. MIL 0.001.210.167
vs. PHI 32.401.211.500
vs. LAA 13.501.143.333
vs. BOS 0.001.010.000
vs. DET 0.001.010.000
vs. MIN 9.001.013.000
vs. NYY 0.001.011.000
vs. SF 0.001.002.500
vs. SEA 18.001.011.571
vs. TOR 0.001.010.250

🏟️This Season at Each Ballpark

Ballpark ERAIPKBBOpp AVG
Total 4.0358.05726.227
Busch Stadium II 3.3030.0249.234
Great American 0.003.263.083
Minute Maid Park 0.002.030.167
Nationals Park 0.002.020.000
PETCO Park 9.002.040.250
Wrigley Field 0.002.011.000
Angel Stadium 13.501.143.333
Dodger Stadium 13.501.111.333
AT&T Park 0.001.002.500
Chase Field 0.001.011.333
Comerica Park 0.001.010.000
Coors Field 0.001.020.250
Kauffman Stadium 18.001.010.400
Marlins Park 0.001.010.250
PNC Park 0.001.010.250
Rogers Centre 0.001.010.250
Target Field 9.001.013.000
Yankee Stadium 0.001.011.000
Citizens Bank Park 81.000.201.714

📅By Month & Recent Form

Split ERAIPKBBOpp AVG
Last 7 Days 5.403.133.333
Last 15 Days 5.065.143.333
Last 30 Days 7.8410.196.310
March 0.003.120.250
April 1.5012.0151.186
May 6.3010.0103.270
June 5.4010.077.237
July 2.168.1127.148
August 5.7311.085.238
September 5.403.133.333

🎯Pitch Arsenal (2026)

Type Pitches Usage% Zone% Chase% Whiff% BA wOBA xwOBA
Sinker 587 59.3% 41.1% 23.2% 14.4% .271 .361 .423
Sweeper 317 32.0% 21.8% 62.6% 44.9% .130 .272 .258
Slider 76 7.7% 28.9% 16.7% 16.7% .158 .225 .418
Changeup 10 1.0% 20.0% 50.0% 50.0% — .700 .702

🌀Pitch Movement (2026)

Type # Velo Spin IVB H-Break Ext
Sinker 380 97.7 2,198 +4.2" +1.4" 6.8
Sweeper 224 82.8 2,309 -4.9" -1.2" 6.7
Slider 39 90.6 2,453 +3.7" -0.2" 6.7

IVB = induced vertical break (gravity removed) · H-Break = horizontal movement · Ext = release extension in feet.

📋Recent Game Log

DateOppScore IPHERBBKERAPCDec
W Friday, September 11, 2026 CHW 3-7 1.000013.9711—
L Monday, September 7, 2026 SF 4-5 1.010204.0311—
W Friday, September 4, 2026 COL 7-6 1.010024.1112S
L Thursday, September 3, 2026 LAD 2-3 0.122104.1817L
W Wednesday, September 2, 2026 LAD 8-6 1.000013.8817S
W Thursday, August 27, 2026 BAL 5-7 1.010013.9511S
L Wednesday, August 26, 2026 BAL 8-7 1.021004.0217L
L Sunday, August 23, 2026 PHI 4-6 0.256103.9339L
W Thursday, August 20, 2026 CIN 10-9 0.110202.9415S
W Tuesday, August 18, 2026 CIN 3-0 1.000012.9613S

👥Team — St. Louis Cardinals

PlayerPosKey Stat
Alec Burleson 1B 0.00 ERA
JJ Wetherholt 2B .242 AVG
Nolan Gorman 3B .187 AVG
Blaze Jordan 3B .247 AVG
Cesar Prieto 3B .063 AVG
Ramon Urias 3B .157 AVG
Leo Bernal C .278 AVG
Jimmy Crooks C .179 AVG
Pedro Pages C 4.50 ERA
Nathan Church CF .244 AVG
Victor Scott II CF .197 AVG
Ivan Herrera DH .251 AVG
Joshua Baez LF .238 AVG
Jose Fermin LF .242 AVG
Thomas Saggese LF .268 AVG
Bryan Torres LF 0.00 ERA
Everson Pereira RF .235 AVG
Jordan Walker RF .281 AVG
Justin Bruihl RP 3.55 ERA
Caleb Ferguson RP 5.18 ERA
Ryan Fernandez RP 3.52 ERA
Luis Gastelum RP 4.85 ERA
Gordon Graceffo RP 2.70 ERA
Brycen Mautz RP 9.00 ERA
Hancel Rincon RP 47.25 ERA
George Soriano RP 4.50 ERA
Ryne Stanek RP 4.42 ERA
Peter Strzelecki RP 5.79 ERA
Matt Svanson RP 7.27 ERA
Cade Winquest RP 6.75 ERA
Bruce Zimmermann RP 5.40 ERA
Hunter Dobbins SP 3.67 ERA
Cooper Hjerpe SP 0.00 ERA
Kyle Leahy SP 3.41 ERA
Matthew Liberatore SP 5.57 ERA
Quinn Mathews SP 4.11 ERA
Michael McGreevy SP 3.92 ERA
Andre Pallante SP 3.45 ERA
Masyn Winn SS .236 AVG

See the Full Analysis

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