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Riley O'Brien
St. Louis Cardinals · RHP
#
61
Team
STL · P
Debut
2021 · 6 MLB seasons

Riley O'Brien

Age 31
Contract Value $795,050/yr
Size 6' 4" · 180
Throws RHP
Bats Right
From Seattle, WA
3-4 W-L
Team profile →Rotation →
3.67
ERA
1.22
WHIP
9.5
K/9
3.7
BB/9
41.2
Innings
0
Starts
Riley O'Brien season snapshot
Season stats
ERA
3.67
WHIP
1.22
K/9
9.5
BB/9
3.7
HR/9
0.43
IP
41.2
GS
0
W-L
3-4
Riley O'Brien ERA trend
Last 6
Earned runs per start
Avg 0.3 ER / start
↑ ERA trending up over recent starts.

Riley O'Brien game log

2026 season
DateOpponentIPHERKBBERA
Jul 22Los Angeles Angels100320.00
Jul 20Los Angeles Angels0.12211180.00
Jul 17Arizona Diamondbacks110110.00
Jul 11Atlanta Braves100110.00
Jul 10Atlanta Braves100200.00
Jul 8Milwaukee Brewers110100.00
Jul 4Chicago Cubs100110.00
Jun 30Atlanta Braves110000.00
Jun 28Miami Marlins100100.00
Jun 22Arizona Diamondbacks100000.00
Jun 21Kansas City Royals1221018.00
Jun 16San Diego Padres100010.00
Jun 13Minnesota Twins101139.00
Jun 7Cincinnati Reds110100.00
Jun 6Cincinnati Reds120110.00
Jun 3Texas Rangers100010.00
Jun 2Texas Rangers1332127.00
May 29Chicago Cubs111009.00
May 23Cincinnati Reds1.100210.00
May 19Pittsburgh Pirates1220118.00
May 15Kansas City Royals110000.00
May 14Athletics100200.00
May 12Athletics100010.00
May 10San Diego Padres1223018.00
May 7San Diego Padres100100.00
May 4Milwaukee Brewers0.200000.00
May 2Los Angeles Dodgers1422018.00
Apr 29Pittsburgh Pirates110100.00
Apr 25Seattle Mariners1421118.00
Apr 21Miami Marlins110100.00
Apr 19Houston Astros1.110200.00
Apr 18Houston Astros0.200100.00
Apr 15Cleveland Guardians100200.00
Apr 14Cleveland Guardians100100.00
Apr 10Boston Red Sox100100.00
Apr 8Washington Nationals100000.00
Apr 7Washington Nationals100200.00
Apr 5Detroit Tigers100100.00
Apr 1New York Mets110200.00
Mar 31New York Mets100000.00
Mar 28Tampa Bay Rays120000.00
Mar 26Tampa Bay Rays1.110200.00

Riley O'Brien season splits

Home / away / vs L-R · 2026
Home ERA
ERA4.50
Away ERA
ERA2.93
vs Left AVG
AVG0.265
vs Right AVG
AVG0.194
Riley O'Brien monthly splits
ERA · IP · K · BB · WHIP per month
MonthGSERAIPKBBWHIP
Mar00.003.1200.90
Apr01.5012.01510.75
May06.3010.01031.30
Jun05.4010.0771.60
Jul02.846.11061.58
Pitch arsenal
Usage and average velocity · 2026
SISinker
60.2%98.1 mph
STSweeper
29.8%83.5 mph
SLSlider
8.9%91.1 mph
CHChangeup
1.0%90.9 mph

Performance vs teams

2026 starts · sorted by ERA
TeamERAGS
Arizona Diamondbacks
0.00
2
Atlanta Braves
0.00
3
Milwaukee Brewers
0.00
2
Miami Marlins
0.00
2
Cincinnati Reds
0.00
3
Athletics
0.00
2
Houston Astros
0.00
2
Cleveland Guardians
0.00
2
Boston Red Sox
0.00
1
Washington Nationals
0.00
2
Detroit Tigers
0.00
1
New York Mets
0.00
2
Tampa Bay Rays
0.00
2
Chicago Cubs
4.50
2
San Diego Padres
6.00
3
Kansas City Royals
9.00
2
Minnesota Twins
9.00
1
Pittsburgh Pirates
9.00
2
Texas Rangers
13.50
2
Los Angeles Angels
16.36
2
Los Angeles Dodgers
18.00
1
Seattle Mariners
18.00
1

Hot / Cold zones

Opponent results by strike zone area

AVG by zone

  • Zone 01: .500
  • Zone 02: .111
  • Zone 03: .333
  • Zone 04: .500
  • Zone 05: .136
  • Zone 06: .125
  • Zone 07: .143
  • Zone 08: .214
  • Zone 09: .250
  • Zone 11: .250
  • Zone 12: .000
  • Zone 13: .333
  • Zone 14: .056

OPS by zone

  • Zone 01: 1.500
  • Zone 02: .222
  • Zone 03: .667
  • Zone 04: 1.056
  • Zone 05: .391
  • Zone 06: .375
  • Zone 07: .357
  • Zone 08: .500
  • Zone 09: .538
  • Zone 11: .682
  • Zone 12: .200
  • Zone 13: .667
  • Zone 14: .515

SLG by zone

  • Zone 01: 1.000
  • Zone 02: .111
  • Zone 03: .333
  • Zone 04: .556
  • Zone 05: .273
  • Zone 06: .250
  • Zone 07: .214
  • Zone 08: .286
  • Zone 09: .333
  • Zone 11: .250
  • Zone 12: .000
  • Zone 13: .333
  • Zone 14: .056

OBP by zone

  • Zone 01: .500
  • Zone 02: .111
  • Zone 03: .333
  • Zone 04: .500
  • Zone 05: .130
  • Zone 06: .125
  • Zone 07: .143
  • Zone 08: .214
  • Zone 09: .231
  • Zone 11: .545
  • Zone 12: .200
  • Zone 13: .333
  • Zone 14: .485

numberOfStrikes by zone

  • Zone 01: 15.00
  • Zone 02: 34.00
  • Zone 03: 15.00
  • Zone 04: 18.00
  • Zone 05: 29.00
  • Zone 06: 30.00
  • Zone 07: 17.00
  • Zone 08: 20.00
  • Zone 09: 30.00
  • Zone 11: 21.00
  • Zone 12: 8.00
  • Zone 13: 21.00
  • Zone 14: 55.00

numberOfPitches by zone

  • Zone 01: 22.00
  • Zone 02: 41.00
  • Zone 03: 18.00
  • Zone 04: 37.00
  • Zone 05: 50.00
  • Zone 06: 35.00
  • Zone 07: 27.00
  • Zone 08: 31.00
  • Zone 09: 40.00
  • Zone 11: 93.00
  • Zone 12: 29.00
  • Zone 13: 69.00
  • Zone 14: 202.00

earnedRunAverage by zone

  • Zone 01: -
  • Zone 02: -
  • Zone 03: -
  • Zone 04: -
  • Zone 05: -
  • Zone 06: -
  • Zone 07: -
  • Zone 08: -
  • Zone 09: -
  • Zone 11: -
  • Zone 12: -
  • Zone 13: -
  • Zone 14: -
0.4000.3000.200
.333.250.000.056.500.111.333.500.136.125.143.214.250
0.4000.3000.200

Last 10 matchups

vs Los Angeles Angels — 2026-07-22
0ER · 1ip
→
vs Los Angeles Angels — 2026-07-20
2ER · 0.1ip
→
vs Arizona Diamondbacks — 2026-07-17
0ER · 1ip
→
vs Atlanta Braves — 2026-07-11
0ER · 1ip
→
vs Atlanta Braves — 2026-07-10
0ER · 1ip
→
vs Milwaukee Brewers — 2026-07-08
0ER · 1ip
→
vs Chicago Cubs — 2026-07-04
0ER · 1ip
→
vs Atlanta Braves — 2026-06-30
0ER · 1ip
→
vs Miami Marlins — 2026-06-28
0ER · 1ip
→
vs Arizona Diamondbacks — 2026-06-22
0ER · 1ip
→

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