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Riley O'Brien
Riley O'Brien
St. Louis Cardinals • Pitcher
Age 31 • 6' 4" • 180 lb
Bats: R • Throws: R
MLB Debut: 2021-09-28
Born: Seattle , WA • USA
Draft: 2017
2026 Stats
W
1
L
0
ERA
0.00
WHIP
0.75
IP
1.1
SO
2
SV
0
HLD
0
G
1
GS
0
Career Stats
W
4
L
2
ERA
3.47
WHIP
1.41
IP
59.2
SO
61
SV
6
HLD
6
G
53
GS
1
Year-by-Year Pitching
Year Team GGSIP WLSVSO ERAWHIPAwards
2021 CIN 1 1 1.1 — 1 — 2 13.50 3.75
2022 SEA 1 — 1.0 — — — 1 0.00 2.00
2024 STL 8 — 8.0 — — — 11 11.25 2.63
2025 STL 42 — 48.0 3 1 6 45 2.06 1.15
2026 STL 1 — 1.1 1 — — 2 0.00 0.75
Spring Training
Pitching
YearTeamGGSIPWLSVSOERAWHIP
2021 CIN 3—2.1 ———5 0.000.43
2022 CIN 314.0 ——14 9.001.75
2023 SEA 9—8.1 ——313 3.241.56
2024 STL 10—10.0 ——18 0.901.30
2025 STL 3—3.0 ———6 0.001.67
2026 STL 5—4.2 ———5 1.931.93
Game Logs
Season selector loads one year at a time.
Pitching
Date Opponent IP H R ER BB SO HR
2026-03-26 vs TB 1.1 1 0 0 0 2 0
Transactions
Entire history • newest first.
2026-01-14
RHP Riley O'Brien changed number to 61.
2025-06-09
St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds.
2025-06-06
St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds.
2025-06-05
St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds.
2025-05-02
St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds.
2025-04-25
St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds.
2025-03-15
St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds.
2024-08-27
St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds.
2024-08-11
St. Louis Cardinals activated RHP Riley O'Brien from the 60-day injured list.
2024-08-11
St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds.
2024-07-19
St. Louis Cardinals sent RHP Riley O'Brien on a rehab assignment to Memphis Redbirds.
2024-07-19
St. Louis Cardinals sent RHP Riley O'Brien on a rehab assignment to Memphis Redbirds.
2024-05-10
St. Louis Cardinals transferred RHP Riley O'Brien from the 15-day injured list to the 60-day injured list. Right forearm flexor strain.
2024-03-31
St. Louis Cardinals placed RHP Riley O'Brien on the 15-day injured list retroactive to March 29, 2024. Right forearm flexor strain.
2023-11-05
Seattle Mariners traded RHP Riley O'Brien to St. Louis Cardinals for cash.
2023-01-31
Seattle Mariners invited non-roster RHP Riley O'Brien to spring training.
2023-01-31
RHP Riley O'Brien roster status changed by Seattle Mariners.
2022-06-02
Seattle Mariners sent RHP Riley O'Brien outright to Tacoma Rainiers.
2022-05-27
Seattle Mariners designated RHP Riley O'Brien for assignment.
2022-05-08
Seattle Mariners optioned RHP Riley O'Brien to Tacoma Rainiers.
2022-05-05
Seattle Mariners recalled RHP Riley O'Brien from Tacoma Rainiers.
2022-04-17
Seattle Mariners optioned RHP Riley O'Brien to Tacoma Rainiers.
2022-04-13
Cincinnati Reds designated RHP Riley O'Brien for assignment.
2022-03-27
Cincinnati Reds optioned RHP Riley O'Brien to Louisville Bats.
2021-10-05
Cincinnati Reds recalled RHP Riley O'Brien from Louisville Bats.
2021-09-30
Cincinnati Reds optioned RHP Riley O'Brien to Louisville Bats.
2021-09-28
Cincinnati Reds recalled RHP Riley O'Brien from Louisville Bats.
2021-03-12
Cincinnati Reds optioned P Riley O'Brien to Louisville Bats.
2021-02-03
Riley O'Brien changed number to 84.
2020-11-20
Cincinnati Reds selected the contract of RHP Riley O'Brien from Chattanooga Lookouts.
2020-08-28
Tampa Bay Rays traded Riley O'Brien to Cincinnati Reds for LHP Cody Reed.
2019-02-23
RHP Riley O'Brien assigned to Tampa Bay Rays.
2017-06-20
Tampa Bay Rays signed RHP Riley O'Brien.
Scouting Report
Statcast-style percentiles • Basenerd theme
Season 2026
Ready
Basic Line
Season / Game
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Pitch Arsenal
Usage • Velo • Break • Spin • xwOBA
Pitch N Use% Velo HB IVB Spin xwOBA Whiff% Zone% Chase% BNStuff+ BNCtrl+
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Notes
Primary pitch summary
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Movement Profile (Induced Break)
Pitcher's View: HB vs Rise / Drop (in)
Circles: 12/18/24 in • Dots = pitch types (size ~ pitch count)
Pitch Location Heatmaps
KDE-style blur • fixed zone • catcher POV
vs. LHH
vs. RHH
Zone: left -0.7083 / right 0.7083 • bot 1.595 / top 3.394 • Domain: X [-2,2], Z [0,5]
Statcast Game Log
Per-game pitch metrics from Statcast
Date Pitches Velo BNStuff+ BNCtrl+ Whiff% Zone% Chase% K% BB% xwOBA
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