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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

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
38 64.0 4.08 1.28 23.2% 10.5%
3rd 3
Sv
94th 52.0
IP
182nd 4.19
ERA
143rd 1.34
WHIP
154th 22.7%
K%
216th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
97.7 11.7% 29.4% 49.9% 4.7% 4.80 3.99
29th 94.7
FB MPH
183rd 12.2%
SwStr%
132nd 28.5%
CSW%
226th 51.2%
Str-ICR
181st 4.7%
MTK%
285th 4.94
PLV
259th 3.56
PLA
Saves List
Rank
27th
Saves+Holds List
Rank
114th

Articles

9/26/20262026 Top 400 Dynasty Rankings-v7.0Martin Sekulski

9/22/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 9/22Rick Graham

9/21/2026Fantasy Baseball Relief Pitcher Roundup: 9/20Rick Graham

9/21/2026Things to Watch During the Regular Season's Final WeekPablo Figueroa

9/20/2026Fantasy Baseball Relief Pitcher Roundup: 9/19Rick Graham

See More Articles
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Riley O’Brien Overview

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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 66 0 64.0 3-9 38 1 4.08 1.28 4.67 3.94 4.27 3.99 23.2% 10.5% 7.5 0.70 .291 13.9% 67.1% 37.0% 49.4% 11.7% 29.4% 0.50 4.80
RP MLB Percentile 85 0 72 49-0 99 16 47 58 26 57 47 26 56 37 63 72 47 62 26 48 73 46 62 53 17
RP MLB AVG 42 2 52.0 3-3 3 7 4.19 1.34 4.16 4.17 4.24 3.56 22.7% 9.8% 8.3 1.08 .291 17.6% 72.5% 36.8% 44.0% 12.2% 28.5% 0.50 4.94
Career 118 1 122.1 6-11 44 7 3.83 1.35 4.41 4.26 4.32 3.99 23.0% 11.8% 7.5 0.81 .288 17.7% 73.4% 36.3% 51.5% 11.5% 28.5% 0.47 4.82

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 66 0 64.0 3-9 0 38 1 1,064 659 405 276 53 38 10 0 5 64 29 10 7
RP MLB Percentile 85 0 72 49-0 0 99 16 73 69 23 76 30 23 29 50 46 71 19 1 2
RP MLB AVG 42 2 52.0 3-3 0 3 7 884 565 319 227 48 32 9 1 6 52 21 3 2
Career 118 1 122.1 6-11 0 44 7 2,081 1,273 809 535 102 72 17 2 11 123 63 18 11

Riley O’Brien Advanced

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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 23.2% 10.5% .227 .335 .672 .303 .291 .312 .245 .332 .306 .374 87.4 88.3 5.7 4.67
RP MLB Percentile 56 37 61 74 66 60 47 57 39 26 20 33 53 63 90 26
RP MLB AVG 22.7% 9.8% .241 .389 .712 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 4.16
Career 23.0% 11.8% .228 .349 .694 .313 .288 .312 .241 .328 .304 .360 86.6 87.9 6.0 4.41

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 CIN54.8% (91.9)----23.8% (79.1)21.4% (88.1)-- 54.8% 45.2%
2022 SEA47.8% (92.4)----47.8% (78.0)--- 47.8% 47.8%
2024 STL2.1% (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)3.6% (83.1)17.6% (83.4)0.1% (90.4)-- 48.3% 51.7%
2026 STL-58.4% (97.7)-7.7% (90.6)32.8% (82.9)-1.1% (91.0)-- 58.4% 41.6%
RP MLB Percentile - 95 (91) - 7 (97) 81 (59) - 1 (93) - - 76.9% 22.0%
RP MLB AVG 38.7% (94.7) 26.6% (94.1) 19.7% (89.4) 25.8% (86.1) 20.7% (82.3) 15.3% (80.3) 17.7% (86.1) 18.9% (86.6) 42.7% (61.5) 48.7% 51.2%
Career1.8% (92.5)51.7% (97.8)-17.5% (90.1)18.1% (82.9)9.8% (82.7)1.1% (89.8)-- 53.5% 46.4%

Riley O’Brien Pitch › Results

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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 CIN21.7% (1)----40.0% (4)22.2% (2)-- 21.7% 31.6%
2022 SEA18.2% (0)----18.2% (1)--- 18.2% 18.2%
2024 STL25.0% (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% (5)31.6% (29)0.0% (0)-- 24.0% 31.6%
2026 STL-29.6% (46)-24.4% (9)30.1% (68)-33.3% (2)-- 29.6% 29.1%
RP MLB Percentile - 63 (5) - 18 (68) 58 (3) - 92 (80) - - 70.0% 54.9%
RP MLB AVG 27.2% (32) 27.6% (13) 27.0% (15) 29.7% (28) 28.5% (20) 27.4% (15) 22.4% (21) 22.6% (21) 19.3% (9) 27.9% 28.8%
Career21.1% (2)27.3% (69)-29.9% (48)30.5% (74)29.6% (41)27.3% (4)-- 27.1% 30.0%

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 49.4% 25.0% 20.9% 4.7% 36.6% 34.1% 37.6% 28.3% 16.3% 62.8% 23.3% 7.0% 7.0% 37.0%
RP MLB Percentile 73 15 27 7 36 11 82 72 21 48 59 28 41 48
RP MLB AVG 44.0% 21.7% 24.1% 10.2% 34.6% 40.9% 33.7% 25.4% 18.1% 63.0% 24.5% 5.8% 6.8% 36.8%
Career 51.5% 23.2% 18.9% 6.4% 34.8% 39.6% 32.9% 27.5% 16.8% 63.4% 25.0% 5.5% 6.1% 36.3%

Riley O’Brien Batted Ball › Outcomes

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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 .227 .303 .291 .312 .245 .332 .306 .374 87.4 88.3 5.7 13.9% 37.0% 23.2%
RP MLB Percentile 61 60 47 57 39 26 20 33 53 63 90 62 48 61
RP MLB AVG .241 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 17.6% 36.8% 24.4%
Career .228 .313 .288 .312 .241 .328 .304 .360 86.6 87.9 6.0 17.7% 36.3% 22.4%

Riley O’Brien Approach › Plate Discipline

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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 43.4% 61.9% 44.3% 30.4% 26.5% 16.3% 73.5% 87.2% 51.9% 17.7% 11.7% 29.4% 16.3% 57.0% 0.50 49.9%
RP MLB Percentile 33 24 18 39 57 21 57 25 81 71 46 62 35 29 53 34
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.6% 18.1% 74.4% 83.9% 58.5% 16.4% 12.2% 28.5% 17.1% 58.3% 0.50 51.2%
Career 43.4% 61.2% 44.2% 29.6% 26.0% 16.8% 74.0% 87.3% 52.4% 17.0% 11.5% 28.5% 15.9% 56.3% 0.47 49.6%

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 43.4% 30.1% 26.2% 43.7% 28.5% 22.9% 48.6% 33.2% 40.6% 6.9%
RP MLB Percentile 33 24 57 81 14 47 86 79 30 60
RP MLB AVG 44.5% 34.6% 27.0% 38.4% 36.2% 22.9% 40.9% 29.9% 43.1% 6.6%
Career 43.4% 31.3% 25.4% 43.3% 27.7% 23.1% 49.2% 32.2% 42.4% 6.4%

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 57.3% 11.7% 32.0% 15.2% 63.5% 48.6% 23.1% 23.5% 18.8%
RP MLB Percentile 29 52 79 59 67 35 72 20 45
RP MLB AVG 58.5% 12.1% 29.9% 14.5% 61.0% 50.1% 21.1% 26.7% 19.3%
Career 58.0% 13.5% 29.5% 14.3% 61.3% 49.4% 21.8% 23.9% 20.0%

Riley O’Brien PLV

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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 46.6% 16.3% 37.0% 9.6% 5.3% 0.2 +1 3.31
2026 STL 1,064 4.80 44.6% 16.0% 39.4% 5.3% 4.7% -5.6 -7 3.99
RP MLB Percentile 73 17 35 27 20 20 46 78 80 26
RP MLB AVG 884 4.94 45.8% 17.4% 36.8% 9.1% 4.7% 0.6 -1 3.56
Career 2,081 4.82 44.5% 16.6% 38.9% 5.6% 4.9% 3.9 -1 3.99
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