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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%
34 54.2 3.95 1.23 23.0% 9.8%
3rd 3
Sv
103rd 45.0
IP
179th 4.23
ERA
111th 1.34
WHIP
163rd 22.6%
K%
199th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
97.9 11.1% 28.7% 50.4% 4.4% 4.82 3.99
23rd 94.6
FB MPH
214th 12.2%
SwStr%
172nd 28.5%
CSW%
208th 51.2%
Str-ICR
144th 4.7%
MTK%
279th 4.94
PLV
263rd 3.46
PLA
Saves List
Rank
18th
Saves+Holds List
Rank
60th

Articles

8/27/2026Fantasy Baseball Relief Pitcher Roundup: 8/26Rick Graham

8/25/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 8/25Rick Graham

8/25/2026Fantasy Baseball Relief Pitcher Roundup: 8/24Rick Graham

8/24/2026Fantasy Baseball Relief Pitcher Roundup: 8/23Rick Graham

8/24/2026MLB News & Moments: Phillies Erupt In Ninth, Win On SchwarbombSteve Drumwright

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 56 0 54.2 3-6 34 1 3.95 1.23 4.33 3.64 4.24 3.99 23.0% 9.8% 7.2 0.49 .287 10.0% 70.1% 34.5% 50.3% 11.1% 28.7% 0.48 4.82
RP MLB Percentile 86 0 70 59-5 99 21 47 67 38 68 46 25 53 42 68 86 53 83 33 69 78 37 50 41 18
RP MLB AVG 35 2 45.0 3-2 3 6 4.23 1.34 4.20 4.22 4.27 3.46 22.6% 9.8% 8.3 1.13 .289 17.6% 72.7% 37.0% 43.6% 12.2% 28.5% 0.50 4.94
Career 108 1 113.0 6-8 40 7 3.74 1.33 4.23 4.14 4.30 3.99 22.9% 11.5% 7.4 0.72 .286 16.1% 75.3% 35.0% 52.1% 11.1% 28.1% 0.46 4.83

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 56 0 54.2 3-6 0 34 1 922 567 355 235 44 32 9 0 3 54 23 10 6
RP MLB Percentile 86 0 70 59-5 0 99 21 72 69 21 73 33 28 27 45 63 68 23 1 2
RP MLB AVG 35 2 45.0 3-2 0 3 6 747 477 270 192 40 27 8 1 5 43 18 2 2
Career 108 1 113.0 6-8 0 40 7 1,939 1,181 759 494 93 66 16 2 9 113 57 18 10

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 23.0% 9.8% .221 .312 .642 .294 .287 .301 .234 .324 .290 .357 87.6 89.2 5.3 4.33
RP MLB Percentile 53 42 66 83 74 69 53 65 53 38 40 49 59 50 92 38
RP MLB AVG 22.6% 9.8% .240 .390 .712 .314 .289 .320 .235 .316 .280 .360 87.7 89.2 13.3 4.20
Career 22.9% 11.5% .225 .339 .681 .310 .286 .307 .235 .323 .296 .351 86.6 88.4 5.8 4.23

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-59.9% (97.9)-7.7% (90.8)31.5% (83.1)-1.0% (90.8)-- 59.9% 40.1%
RP MLB Percentile - 95 (93) - 8 (97) 79 (60) - 1 (91) - - 82.0% 17.4%
RP MLB AVG 38.3% (94.6) 26.4% (94.0) 20.1% (89.5) 25.7% (85.8) 21.1% (82.4) 15.9% (79.9) 17.0% (86.1) 17.9% (86.7) 37.0% (65.3) 48.5% 51.4%
Career2.0% (92.5)51.9% (97.8)-18.2% (90.2)16.4% (83.1)10.5% (82.7)1.0% (89.5)-- 53.9% 46.1%

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-30.1% (43)-25.4% (7)26.9% (50)-33.3% (2)-- 30.1% 26.8%
RP MLB Percentile - 67 (4) - 25 (67) 40 (7) - 91 (71) - - 69.1% 29.7%
RP MLB AVG 26.9% (27) 27.3% (11) 26.4% (13) 29.8% (23) 28.3% (17) 26.9% (12) 21.4% (16) 23.1% (18) 22.3% (7) 27.8% 28.8%
Career21.1% (2)27.4% (66)-30.3% (46)27.7% (56)29.6% (41)26.3% (4)-- 27.2% 29.1%

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 50.3% 24.5% 20.4% 4.8% 34.7% 36.5% 35.8% 27.7% 16.7% 65.3% 22.4% 6.1% 6.1% 34.5%
RP MLB Percentile 78 17 24 6 50 21 70 66 29 69 71 37 51 69
RP MLB AVG 43.6% 21.6% 24.6% 10.3% 34.7% 40.9% 33.7% 25.4% 18.2% 62.8% 24.5% 5.9% 6.9% 37.0%
Career 52.1% 22.8% 18.5% 6.6% 33.7% 41.2% 31.7% 27.1% 17.0% 64.8% 24.8% 5.0% 5.6% 35.0%

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 .221 .294 .287 .301 .234 .324 .290 .357 87.6 89.2 5.3 10.0% 34.5% 21.7%
RP MLB Percentile 66 69 53 65 53 38 40 49 59 50 92 83 69 75
RP MLB AVG .240 .314 .289 .320 .235 .316 .280 .360 87.7 89.2 13.3 17.6% 37.0% 24.6%
Career .225 .310 .286 .307 .235 .323 .296 .351 86.6 88.4 5.8 16.1% 35.0% 21.7%

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 43.5% 61.5% 43.8% 29.8% 25.2% 16.7% 74.8% 86.3% 56.1% 17.7% 11.1% 28.7% 16.1% 56.7% 0.48 50.4%
RP MLB Percentile 32 19 15 31 48 29 47 33 63 67 37 50 29 25 41 40
RP MLB AVG 44.5% 63.8% 47.4% 31.8% 25.6% 18.2% 74.4% 83.9% 58.5% 16.4% 12.2% 28.5% 17.1% 58.4% 0.50 51.2%
Career 43.4% 60.9% 43.9% 29.3% 25.4% 17.0% 74.6% 87.0% 54.5% 17.0% 11.1% 28.1% 15.8% 56.1% 0.46 49.9%

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 43.5% 30.3% 26.1% 43.6% 29.1% 23.3% 47.6% 32.2% 41.6% 7.3%
RP MLB Percentile 32 25 64 81 16 43 83 72 40 59
RP MLB AVG 44.5% 34.4% 27.1% 38.5% 36.4% 22.9% 40.7% 29.8% 43.1% 6.6%
Career 43.4% 31.5% 25.3% 43.2% 28.0% 23.3% 48.8% 31.6% 43.0% 6.6%

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 56.9% 11.6% 32.2% 15.0% 63.4% 48.7% 22.9% 22.9% 18.2%
RP MLB Percentile 24 53 79 57 66 35 65 17 36
RP MLB AVG 58.5% 12.1% 30.0% 14.4% 61.0% 50.2% 21.2% 26.9% 19.2%
Career 57.8% 13.6% 29.4% 14.1% 61.1% 49.6% 21.6% 23.6% 19.8%

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 46.6% 16.3% 37.0% 9.6% 5.3% 0.2 +1 3.31
2026 STL 922 4.82 45.6% 15.1% 39.4% 6.2% 4.4% -6.3 -8 3.99
RP MLB Percentile 72 18 42 15 21 21 56 83 87 25
RP MLB AVG 747 4.94 46.0% 17.4% 36.6% 9.3% 4.7% 0.7 0 3.46
Career 1,939 4.83 44.9% 16.2% 38.9% 6.1% 4.7% 3.3 -2 3.99
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