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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%
26 43.2 3.50 1.19 24.5% 9.6%
4th 2
Sv
117th 37.0
IP
138th 4.26
ERA
102nd 1.35
WHIP
124th 22.4%
K%
188th 9.9%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.1 12.1% 28.9% 50.8% 4.0% 4.79 4.06
17th 94.7
FB MPH
159th 12.1%
SwStr%
152nd 28.5%
CSW%
182nd 50.9%
Str-ICR
116th 4.7%
MTK%
294th 4.93
PLV
268th 3.53
PLA
Saves List
Rank
19th
Saves+Holds List
Rank
69th

Articles

7/30/2026Fantasy Baseball Relief Pitcher Roundup: 7/29Rick Graham

7/28/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/28Rick Graham

7/24/20262026 Top 400 Dynasty Rankings- v4.0Martin Sekulski

7/23/2026Fantasy Baseball Relief Pitcher Roundup: 7/22Rick Graham

7/22/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/21Rick 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 44 0 43.2 3-4 26 1 3.50 1.19 4.62 3.53 4.27 4.06 24.5% 9.6% 7.0 0.41 .291 8.3% 72.6% 32.5% 53.1% 12.1% 28.9% 0.48 4.79
RP MLB Percentile 79 0 64 66-9 99 26 60 69 32 69 50 23 64 45 69 87 47 83 48 82 87 53 55 45 15
RP MLB AVG 29 2 37.0 2-2 2 5 4.26 1.35 4.26 4.29 4.33 3.53 22.4% 9.9% 8.3 1.14 .289 18.0% 72.5% 37.0% 43.7% 12.1% 28.5% 0.50 4.93
Career 96 1 102.0 6-6 32 7 3.53 1.32 4.34 4.15 4.32 4.02 23.5% 11.6% 7.3 0.71 .287 16.0% 76.9% 34.2% 53.5% 11.6% 28.1% 0.46 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 44 0 43.2 3-4 0 26 1 729 444 285 188 34 26 6 0 2 46 18 10 5
RP MLB Percentile 79 0 64 66-9 0 99 26 68 63 23 69 40 29 38 40 71 71 28 0 3
RP MLB AVG 29 2 37.0 2-2 0 2 5 625 399 227 161 34 23 6 1 5 36 15 2 1
Career 96 1 102.0 6-6 0 32 7 1,746 1,058 689 447 83 60 13 2 8 105 52 18 9

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 24.5% 9.6% .217 .293 .626 .289 .291 .304 .240 .334 .303 .377 86.7 88.8 2.8 4.62
RP MLB Percentile 64 45 67 83 72 67 47 60 45 32 28 36 69 53 96 32
RP MLB AVG 22.4% 9.9% .241 .392 .717 .316 .289 .320 .237 .318 .281 .361 87.8 89.3 13.2 4.26
Career 23.5% 11.6% .224 .334 .679 .309 .287 .309 .238 .327 .302 .358 86.1 88.1 4.8 4.34

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-60.2% (98.1)-8.8% (91.1)30.0% (83.4)-1.0% (90.9)-- 60.2% 39.8%
RP MLB Percentile - 95 (95) - 13 (98) 76 (62) - 1 (92) - - 83.5% 16.5%
RP MLB AVG 37.8% (94.7) 26.1% (93.9) 20.5% (89.4) 25.4% (85.5) 21.3% (82.5) 16.4% (79.9) 17.2% (86.2) 18.3% (86.4) 32.3% (68.3) 48.3% 51.5%
Career2.2% (92.5)51.2% (97.9)-19.8% (90.2)14.2% (83.4)11.6% (82.7)1.0% (89.4)-- 53.4% 46.6%

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-30.3% (38)-25.0% (7)27.4% (41)-28.6% (2)-- 30.3% 26.9%
RP MLB Percentile - 68 (3) - 24 (60) 45 (9) - 78 (70) - - 73.2% 33.6%
RP MLB AVG 27.1% (23) 27.2% (9) 26.9% (11) 29.1% (18) 28.0% (15) 27.5% (10) 21.6% (14) 23.4% (16) 22.0% (8) 27.9% 28.7%
Career21.1% (2)27.2% (61)-30.3% (46)28.3% (47)29.6% (41)23.5% (4)-- 26.9% 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 53.1% 22.1% 21.2% 3.5% 31.0% 38.6% 36.8% 24.6% 16.3% 67.3% 21.2% 5.3% 6.2% 32.5%
RP MLB Percentile 87 49 29 5 80 32 74 42 21 81 78 50 55 82
RP MLB AVG 43.7% 21.7% 24.4% 10.2% 34.7% 40.9% 34.0% 25.1% 18.0% 62.8% 24.4% 5.8% 7.1% 37.0%
Career 53.5% 21.6% 18.6% 6.3% 32.0% 42.6% 31.6% 25.7% 16.9% 65.4% 24.5% 4.5% 5.6% 34.2%

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 .217 .289 .291 .304 .240 .334 .303 .377 86.7 88.8 2.8 8.3% 32.5% 19.7%
RP MLB Percentile 67 67 47 60 45 32 28 36 69 53 96 83 82 88
RP MLB AVG .241 .316 .289 .320 .237 .318 .281 .361 87.8 89.3 13.2 18.0% 37.0% 24.6%
Career .224 .309 .287 .309 .238 .327 .302 .358 86.1 88.1 4.8 16.0% 34.2% 20.8%

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 42.2% 60.9% 44.0% 29.0% 27.4% 16.3% 72.6% 83.9% 54.1% 16.9% 12.1% 28.9% 15.6% 56.2% 0.48 50.8%
RP MLB Percentile 21 15 19 29 64 21 64 54 73 56 53 55 27 22 45 47
RP MLB AVG 44.5% 63.6% 47.3% 31.5% 25.6% 18.0% 74.4% 83.7% 58.6% 16.3% 12.1% 28.5% 17.1% 58.2% 0.50 50.9%
Career 42.9% 60.6% 44.0% 28.9% 26.3% 16.9% 73.7% 86.0% 53.5% 16.6% 11.6% 28.1% 15.6% 55.8% 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 42.2% 32.1% 25.7% 42.2% 29.6% 23.0% 47.3% 33.6% 40.7% 7.3%
RP MLB Percentile 21 37 70 76 19 47 82 83 29 70
RP MLB AVG 44.5% 34.7% 26.9% 38.4% 36.2% 22.9% 40.8% 29.9% 43.2% 6.6%
Career 42.9% 32.4% 25.0% 42.6% 28.1% 23.2% 48.8% 32.1% 42.8% 6.5%

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 57.5% 11.7% 31.8% 15.5% 63.9% 48.7% 22.0% 22.0% 19.8%
RP MLB Percentile 35 52 70 69 69 33 58 15 59
RP MLB AVG 58.5% 12.3% 29.7% 14.5% 60.7% 50.0% 21.0% 26.5% 19.2%
Career 58.1% 13.8% 29.0% 14.2% 61.0% 49.7% 21.1% 23.3% 20.8%

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 729 4.79 45.0% 15.1% 39.9% 5.1% 4.0% -6.6 -6 4.06
RP MLB Percentile 68 15 36 18 17 17 64 85 75 23
RP MLB AVG 625 4.93 45.8% 17.4% 36.8% 9.0% 4.7% 0.8 0 3.53
Career 1,746 4.82 44.6% 16.3% 39.0% 5.6% 4.6% 3.0 +0 4.02
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