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Riley O'Brien

#61 - Relief Pitcher

St. Louis Cardinals

Bats / Throws Right / Right
Date of Birth 2/6/1995 (31)
Height, Weight 6'4", 180 lb
Hometown Seattle, WA

2026 Season Stats

Needs more playing time to qualify
MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
7 14.1 1.26 0.77 29.6% 1.9%
- 1
Sv
- 9.0
IP
- 5.72
ERA
- 1.60
WHIP
- 22.0%
K%
- 11.3%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.2 12.9% 30.0% 58.1% 3.7% 4.98 3.01
- 94.2
FB MPH
- 11.9%
SwStr%
- 28.4%
CSW%
- 49.6%
Str-ICR
- 4.2%
MTK%
- 4.96
PLV
- 3.75
PLA
Saves List
Rank
8th
Saves+Holds List
Rank
14th

Articles

4/25/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 4/25Rick Graham

4/24/2026Waiver Relief: Week 5Alex Kamberis

4/24/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 4/24Rick Graham

4/23/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 4/23Rick Graham

4/23/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 4/23Rick Graham

See More Articles
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Riley O’Brien Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR GB% SwStr% CSW% IPR PLV
2021 CIN 1 1 1.1 0-1 0 0 13.50 3.75 16.76 31.35 10.16 12.60 22.2% 33.3% 13.5 13.50 .000 200.0% 100.0% 50.0% 50.0% 16.7% 26.2% 0.38 4.08
2022 SEA 1 0 1.0 0-0 0 0 0.00 2.00 1.43 4.11 4.11 6.32 20.0% 20.0% 9.0 0.00 .333 - 100.0% - 100.0% 8.7% 21.7% 0.39 4.63
2024 STL 8 0 8.0 0-0 0 0 11.25 2.63 6.56 7.04 5.58 6.39 23.9% 17.4% 14.6 2.25 .458 33.3% 62.5% 46.2% 38.5% 10.8% 26.8% 0.38 4.67
2025 STL 42 0 48.0 3-1 6 6 2.06 1.15 3.44 3.61 4.04 3.31 22.6% 11.1% 6.2 0.38 .254 10.5% 82.8% 33.6% 56.1% 11.1% 28.0% 0.47 4.93
2026 STL 14 0 14.1 3-1 7 1 1.26 0.77 1.91 1.50 2.14 3.01 29.6% 1.9% 6.3 0.00 .286 0.0% 76.9% 22.9% 71.4% 12.9% 30.0% 0.59 4.98
RP MLB Percentile - - - --- - - - - - - - - - - - - - - - - - - - - -
RP MLB AVG 7 0 9.0 0-1 1 1 5.72 1.60 4.89 5.34 4.80 3.75 22.0% 11.3% 9.5 1.29 .308 19.1% 71.6% 38.5% 43.3% 11.9% 28.4% 0.48 4.96
Career 66 1 72.2 6-3 13 7 3.10 1.29 3.70 4.01 3.93 3.80 24.0% 11.2% 7.3 0.74 .285 20.0% 79.5% 33.2% 57.1% 11.5% 28.0% 0.47 4.86

Riley O’Brien Repertoire

2021 2022 2024 2025 2026 All
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Riley O’Brien Game Log

Riley O’Brien Standard

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Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
2021 CIN 1 1 1.1 0-1 0 0 0 42 22 20 9 2 0 0 0 2 2 3 0 0
2022 SEA 1 0 1.0 0-0 0 0 0 23 14 9 5 1 1 0 0 0 1 1 0 0
2024 STL 8 0 8.0 0-0 0 0 0 194 108 86 46 13 8 2 1 2 11 8 1 1
2025 STL 42 0 48.0 3-1 0 6 6 758 470 289 199 33 25 5 1 2 45 22 7 3
2026 STL 14 0 14.1 3-1 0 7 1 217 142 75 54 10 9 1 0 0 16 1 2 3
RP MLB Percentile - - - --- - - - - - - - - - - - - - - - -
RP MLB AVG 7 0 9.0 0-1 0 1 1 169 107 63 43 9 6 2 0 1 10 5 1 1
Career 66 1 72.2 6-3 0 13 7 1,234 756 479 313 59 43 8 2 6 75 35 10 7

Riley O’Brien Advanced

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2021 CIN 22.2% 33.3% .333 1.333 1.889 .677 .000 .500 .337 .626 .237 .890 88.9 106.4 -9.5 16.76
2022 SEA 20.0% 20.0% .250 .250 .650 .315 .333 .333 .069 .187 .092 .082 98.5 - -23.0 1.43
2024 STL 23.9% 17.4% .361 .639 1.117 .467 .458 .500 .283 .397 .342 .463 89.0 92.1 17.7 6.56
2025 STL 22.6% 11.1% .196 .274 .587 .270 .254 .266 .226 .289 .300 .302 84.6 85.0 5.1 3.44
2026 STL 29.6% 1.9% .196 .216 .457 .215 .286 .286 .183 .219 .259 .276 84.3 86.3 -5.5 1.91
RP MLB Percentile - - - - - - - - - - - - - - - -
RP MLB AVG 22.0% 11.3% .257 .415 .761 .338 .308 .339 .248 .337 .293 .382 88.4 89.6 13.4 4.89
Career 24.0% 11.2% .223 .336 .669 .309 .285 .307 .226 .308 .293 .335 85.5 87.3 4.2 3.70

Riley O’Brien Pitch › Mix

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Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
2021 CIN 54.8% (91.9) - - - - 23.8% (79.1) 21.4% (88.1) - - 54.8% 45.2%
2022 SEA 47.8% (92.4) - - - - 47.8% (78.0) - - - 47.8% 47.8%
2024 STL 2.1% (96.1) 45.9% (96.8) - 26.3% (89.7) 0.5% (84.7) 25.3% (82.6) - - - 47.9% 52.1%
2025 STL - 48.3% (98.0) - 30.5% (90.0) 2.8% (83.0) 18.3% (83.4) 0.1% (90.4) - - 48.3% 51.7%
2026 STL - 58.5% (98.2) - 15.2% (91.5) 25.8% (83.6) - 0.5% (90.4) - - 58.5% 41.5%
RP MLB Percentile - - - - - - - - - - -
RP MLB AVG 34.7% (94.2) 26.8% (93.8) 21.2% (89.2) 27.9% (85.5) 23.2% (82.5) 18.1% (80.8) 19.1% (86.0) 19.9% (86.5) - (-) 47.3% 52.6%
Career 3.1% (92.5) 47.2% (97.9) - 25.5% (90.1) 6.3% (90.1) 16.9% (82.7) 0.9% (88.5) - - 50.2% 49.7%

Riley O’Brien Pitch › Results

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
2021 CIN 21.7% (1) - - - - 40.0% (4) 22.2% (2) - - 21.7% 31.6%
2022 SEA 18.2% (0) - - - - 18.2% (1) - - - 18.2% 27.3%
2024 STL 25.0% (1) 24.7% (5) - 31.4% (7) 100.0% (1) 24.5% (7) - - - 24.7% 28.7%
2025 STL - 24.0% (18) - 31.6% (32) 33.3% (3) 31.7% (31) 0.0% (0) - - 24.0% 31.6%
2026 STL - 37.0% (16) - 24.2% (5) 17.9% (7) - 0.0% (0) - - 37.0% 20.0%
RP MLB Percentile - - - - - - - - - - -
RP MLB AVG 26.5% (6) 27.9% (3) 28.0% (4) 31.0% (6) 28.7% (6) 28.0% (4) 22.4% (5) 25.0% (7) - (-) 27.9% 28.4%
Career 21.1% (2) 27.0% (39) - 30.8% (44) 23.1% (11) 29.7% (43) 18.2% (2) - - 26.6% 29.4%

Riley O’Brien Batted Ball › Contact

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Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR
2021 CIN 50.0% 25.0% 25.0% 0.0% 50.0% 75.0% 25.0% 0.0% 16.7% 50.0% 0.0% 0.0% 50.0% 50.0%
2022 SEA 100.0% 0.0% 0.0% 0.0% 0.0% 33.3% 33.3% 33.3% 26.1% 100.0% 0.0% 0.0% 0.0% -
2024 STL 38.5% 23.1% 23.1% 15.4% 46.2% 53.8% 34.6% 11.5% 15.5% 53.8% 34.6% 3.8% 7.7% 46.2%
2025 STL 56.1% 21.1% 15.4% 7.3% 30.1% 43.2% 26.4% 30.4% 17.5% 65.9% 26.8% 4.1% 3.3% 33.6%
2026 STL 71.4% 14.3% 11.4% 2.9% 17.1% 48.6% 31.4% 20.0% 19.4% 77.2% 17.1% 5.7% 0.0% 22.9%
RP MLB Percentile - - - - - - - - - - - - - -
RP MLB AVG 43.3% 22.1% 24.5% 10.1% 35.4% 41.6% 33.6% 24.8% 17.3% 61.3% 25.0% 5.9% 7.9% 38.5%
Career 57.1% 19.9% 15.7% 7.3% 29.8% 46.1% 28.5% 25.4% 17.7% 66.5% 25.1% 4.2% 4.2% 33.2%

Riley O’Brien Batted Ball › Outcomes

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR IPA%
2021 CIN .333 .677 .000 .500 .337 .626 .237 .890 88.9 106.4 -9.5 200.0% 50.0% 22.2%
2022 SEA .250 .315 .333 .333 .069 .187 .092 .082 98.5 - -23.0 - - -
2024 STL .361 .467 .458 .500 .283 .397 .342 .463 89.0 92.1 17.7 33.3% 46.2% 26.1%
2025 STL .196 .270 .254 .266 .226 .289 .300 .302 84.6 85.0 5.1 10.5% 33.6% 21.1%
2026 STL .196 .215 .286 .286 .183 .219 .259 .276 84.3 86.3 -5.5 0.0% 22.9% 14.8%
RP MLB Percentile - - - - - - - - - - - - - -
RP MLB AVG .257 .338 .308 .339 .248 .337 .293 .382 88.4 89.6 13.4 19.1% 38.5% 25.1%
Career .223 .309 .285 .307 .226 .308 .293 .335 85.5 87.3 4.2 20.0% 33.2% 20.4%

Riley O’Brien Approach › Plate Discipline

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR Str-ICR
2021 CIN 31.0% 52.4% 42.9% 31.0% 38.9% 16.7% 61.1% 88.9% 33.3% 9.5% 16.7% 26.2% 9.5% 47.6% 0.38 42.9%
2022 SEA 52.2% 60.9% 47.8% 18.2% 18.2% 26.1% 81.8% 87.5% 100.0% 13.0% 8.7% 21.7% 13.0% 56.5% 0.39 -
2024 STL 42.8% 55.7% 39.7% 22.5% 27.3% 15.5% 72.7% 78.8% 60.0% 16.0% 10.8% 26.8% 13.4% 49.0% 0.38 43.3%
2025 STL 43.9% 62.0% 45.1% 30.6% 24.6% 17.5% 75.4% 89.6% 52.3% 16.9% 11.1% 28.0% 16.5% 57.7% 0.47 50.9%
2026 STL 43.8% 65.4% 48.4% 33.6% 26.7% 19.4% 73.3% 81.3% 61.0% 17.1% 12.9% 30.0% 16.1% 60.8% 0.59 58.1%
RP MLB Percentile - - - - - - - - - - - - - - - -
RP MLB AVG 43.9% 62.6% 46.1% 30.3% 25.6% 17.3% 74.4% 83.8% 58.4% 16.5% 11.9% 28.4% 16.8% 57.0% 0.48 49.6%
Career 43.4% 61.3% 44.8% 29.7% 25.7% 17.7% 74.3% 86.4% 54.6% 16.5% 11.5% 28.0% 15.6% 56.5% 0.47 50.9%

Riley O’Brien Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2021 CIN 31.0% 23.8% 11.9% 64.3% 21.4% 26.2% 52.4% 33.3% 54.8% 2.4%
2022 SEA 52.2% 36.4% 36.4% 27.3% 9.1% 27.3% 63.6% 18.2% 45.5% 9.1%
2024 STL 42.8% 35.6% 17.5% 46.9% 21.1% 28.9% 50.0% 36.1% 46.4% 8.2%
2025 STL 43.9% 32.2% 26.8% 41.0% 29.3% 21.5% 49.2% 30.1% 43.1% 5.5%
2026 STL 43.8% 36.4% 26.3% 37.3% 30.9% 19.8% 49.3% 35.0% 38.7% 5.5%
RP MLB Percentile - - - - - - - - - -
RP MLB AVG 43.9% 34.8% 26.4% 38.8% 36.2% 22.7% 41.0% 30.3% 43.4% 6.3%
Career 43.4% 33.3% 24.9% 41.8% 27.7% 22.6% 49.7% 31.8% 43.3% 5.9%

Riley O’Brien Approach › Counts

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Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2021 CIN 57.1% 9.5% 33.3% 8.3% 66.7% 66.7% 16.7% 21.4% 14.3%
2022 SEA 56.5% 13.0% 30.4% 7.7% 60.0% 40.0% 15.4% - 14.3%
2024 STL 54.6% 20.6% 24.7% 11.3% 45.7% 37.0% 17.9% 25.0% 22.9%
2025 STL 59.8% 14.4% 27.0% 14.1% 61.6% 53.0% 21.4% 25.4% 22.0%
2026 STL 57.1% 8.3% 34.6% 15.3% 74.5% 54.5% 25.0% 26.7% 21.3%
RP MLB Percentile - - - - - - - - -
RP MLB AVG 58.5% 13.1% 29.0% 13.7% 59.5% 49.7% 21.1% 26.3% 19.6%
Career 58.3% 14.1% 28.3% 13.6% 61.7% 51.1% 21.3% 24.9% 21.5%

Riley O’Brien PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2021 CIN 42 4.08 26.2% 28.6% 45.2% -19.0% 0.0% 2.1 +0 12.60
2022 SEA 23 4.63 39.1% 13.0% 47.8% -8.7% 17.4% 0.7 +0 6.32
2024 STL 194 4.67 40.2% 18.6% 41.2% -1.0% 3.6% 6.5 +4 6.39
2025 STL 758 4.93 46.2% 17.0% 36.8% 9.5% 5.3% 0.2 +2 3.31
2026 STL 217 4.98 45.2% 18.9% 35.9% 9.2% 3.7% -4.2 -2 3.01
RP MLB Percentile - - - - - - - - - -
RP MLB AVG 169 4.96 45.8% 17.9% 36.3% 9.5% 4.2% 1.5 +1 3.75
Career 1,234 4.86 44.3% 17.9% 37.8% 6.5% 4.8% 5.3 +4 3.80
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