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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
87th 51.0
IP
185th 4.20
ERA
140th 1.35
WHIP
159th 22.6%
K%
220th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
97.7 11.7% 29.4% 49.9% 4.5% 4.80 3.99
27th 94.7
FB MPH
184th 12.1%
SwStr%
132nd 28.5%
CSW%
222nd 51.2%
Str-ICR
166th 4.7%
MTK%
287th 4.94
PLV
255th 3.50
PLA
Saves List
Rank
17th
Saves+Holds List
Rank
74th

Articles

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

9/17/2026Fantasy Baseball Relief Pitcher Roundup: 9/16Rick Graham

9/17/2026WAF 228 - 2026 Surprising StatsSteve Gesuele

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 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 89 0 74 52-0 99 17 47 58 28 57 47 27 54 37 61 72 47 63 25 48 74 47 62 50 17
RP MLB AVG 41 2 51.0 3-3 3 7 4.20 1.35 4.20 4.19 4.25 3.50 22.6% 9.8% 8.3 1.10 .291 17.7% 72.7% 36.8% 44.0% 12.1% 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 89 0 74 52-0 0 99 17 75 73 20 78 27 21 27 48 45 74 18 1 2
RP MLB AVG 41 2 51.0 3-3 0 3 7 853 546 308 219 46 31 9 1 6 50 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 .333 .306 .374 87.4 88.3 5.7 4.67
RP MLB Percentile 54 37 60 74 65 61 47 58 39 28 19 34 53 63 90 28
RP MLB AVG 22.6% 9.8% .241 .390 .714 .315 .291 .322 .235 .315 .280 .359 87.7 89.2 13.1 4.20
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) - 8 (97) 81 (57) - 1 (93) - - 77.1% 22.0%
RP MLB AVG 38.7% (94.7) 26.6% (94.1) 19.7% (89.4) 25.8% (86.1) 21.0% (82.4) 15.5% (80.3) 17.5% (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

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 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) - 20 (67) 59 (3) - 92 (78) - - 68.9% 53.1%
RP MLB AVG 27.1% (31) 27.4% (13) 26.8% (14) 29.6% (27) 28.4% (19) 27.2% (15) 22.3% (20) 22.5% (20) 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 74 18 26 7 36 11 83 71 21 49 59 27 41 48
RP MLB AVG 44.0% 21.7% 24.2% 10.1% 34.7% 41.0% 33.6% 25.4% 18.2% 62.9% 24.6% 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

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 .227 .303 .291 .312 .245 .333 .306 .374 87.4 88.3 5.7 13.9% 37.0% 23.2%
RP MLB Percentile 60 61 47 58 39 28 19 34 53 63 90 63 48 61
RP MLB AVG .241 .315 .291 .322 .235 .315 .280 .359 87.7 89.2 13.1 17.7% 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 34 25 19 38 56 21 56 25 80 73 47 62 35 30 50 36
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.6% 18.2% 74.4% 84.0% 58.5% 16.4% 12.1% 28.5% 17.1% 58.4% 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 34 23 58 81 14 48 86 79 29 61
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 27 53 77 59 68 35 73 20 43
RP MLB AVG 58.6% 12.1% 29.9% 14.5% 61.1% 50.3% 21.2% 26.8% 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 44.7% 16.0% 39.3% 5.5% 4.5% -5.6 -7 3.99
RP MLB Percentile 75 17 37 25 21 21 49 78 81 27
RP MLB AVG 853 4.94 45.9% 17.4% 36.7% 9.2% 4.7% 0.7 0 3.50
Career 2,081 4.82 44.6% 16.6% 38.9% 5.7% 4.8% 4.0 -1 3.99
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