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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%
27 45.2 3.35 1.18 24.5% 9.7%
5th 2
Sv
120th 39.0
IP
114th 4.30
ERA
93rd 1.36
WHIP
120th 22.3%
K%
173rd 9.9%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.0 11.8% 29.3% 51.4% 3.9% 4.82 3.98
20th 94.7
FB MPH
170th 12.1%
SwStr%
143rd 28.5%
CSW%
178th 51.0%
Str-ICR
127th 4.7%
MTK%
286th 4.94
PLV
258th 3.47
PLA
Saves List
Rank
20th
Saves+Holds List
Rank
65th

Articles

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7/31/2026Fantasy Baseball Relief Pitcher Roundup: 7/30Rick Graham

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

7/28/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/28Rick 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 46 0 45.2 3-4 27 1 3.35 1.18 4.51 3.47 4.29 3.98 24.5% 9.7% 6.9 0.39 .287 7.7% 73.5% 31.9% 51.7% 11.8% 29.3% 0.50 4.82
RP MLB Percentile 80 0 65 63-9 99 25 68 71 34 74 51 27 65 50 72 87 49 86 50 80 84 50 59 49 18
RP MLB AVG 30 2 39.0 2-2 2 5 4.30 1.36 4.29 4.30 4.34 3.47 22.3% 9.9% 8.3 1.15 .288 18.1% 72.4% 36.8% 43.7% 12.1% 28.5% 0.50 4.94
Career 98 1 104.0 6-6 33 7 3.46 1.32 4.30 4.11 4.33 3.99 23.5% 11.6% 7.3 0.69 .286 15.4% 77.2% 33.9% 52.9% 11.5% 28.3% 0.47 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 46 0 45.2 3-4 0 27 1 769 471 298 196 35 27 6 0 2 48 19 10 5
RP MLB Percentile 80 0 65 63-9 0 99 25 69 64 23 69 41 28 40 42 73 69 31 1 3
RP MLB AVG 30 2 39.0 2-2 0 2 5 648 413 234 166 35 23 6 1 5 37 16 2 2
Career 98 1 104.0 6-6 0 33 7 1,786 1,085 702 455 84 61 13 2 8 107 53 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% 9.7% .213 .287 .617 .285 .287 .299 .238 .330 .302 .371 86.2 88.4 3.6 4.51
RP MLB Percentile 65 50 69 87 77 72 49 65 44 34 22 38 71 65 95 34
RP MLB AVG 22.3% 9.9% .241 .393 .717 .316 .288 .319 .237 .318 .280 .360 87.7 89.2 13.2 4.29
Career 23.5% 11.6% .222 .331 .674 .307 .286 .307 .237 .325 .301 .356 85.9 88.0 5.1 4.30

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-60.9% (98.0)-8.3% (91.1)29.9% (83.3)-0.9% (90.9)-- 60.9% 39.1%
RP MLB Percentile - 95 (94) - 10 (97) 76 (61) - 0 (92) - - 83.9% 15.9%
RP MLB AVG 37.8% (94.7) 26.1% (93.9) 20.3% (89.4) 25.7% (85.6) 21.2% (82.5) 16.1% (79.9) 17.2% (86.2) 17.9% (86.4) 32.3% (68.3) 48.3% 51.5%
Career2.1% (92.5)51.7% (97.9)-19.4% (90.2)14.5% (83.3)11.4% (82.7)1.0% (89.4)-- 53.8% 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-30.8% (39)-25.0% (7)27.4% (43)-28.6% (2)-- 30.8% 26.9%
RP MLB Percentile - 70 (3) - 23 (62) 45 (9) - 77 (70) - - 76.5% 34.8%
RP MLB AVG 26.9% (24) 27.3% (9) 26.6% (12) 29.3% (20) 27.7% (15) 27.3% (10) 21.7% (14) 23.3% (16) 22.0% (8) 27.8% 28.7%
Career21.1% (2)27.5% (62)-30.3% (46)28.3% (49)29.6% (41)23.5% (4)-- 27.3% 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 51.7% 22.9% 22.0% 3.4% 32.2% 37.0% 38.7% 24.4% 16.5% 67.8% 21.2% 5.1% 5.9% 31.9%
RP MLB Percentile 84 42 31 4 65 28 81 41 22 79 70 56 61 80
RP MLB AVG 43.7% 21.7% 24.4% 10.2% 34.8% 41.0% 33.8% 25.2% 18.1% 62.9% 24.3% 5.8% 7.0% 36.8%
Career 52.9% 21.9% 19.0% 6.2% 32.5% 41.9% 32.5% 25.6% 17.0% 65.7% 24.5% 4.4% 5.5% 33.9%

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 .213 .285 .287 .299 .238 .330 .302 .371 86.2 88.4 3.6 7.7% 31.9% 19.4%
RP MLB Percentile 69 72 49 65 44 34 22 38 71 65 95 86 80 86
RP MLB AVG .241 .316 .288 .319 .237 .318 .280 .360 87.7 89.2 13.2 18.1% 36.8% 24.5%
Career .222 .307 .286 .307 .237 .325 .301 .356 85.9 88.0 5.1 15.4% 33.9% 20.7%

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 42.7% 61.2% 43.8% 29.3% 27.0% 16.5% 73.0% 83.7% 55.8% 17.4% 11.8% 29.3% 15.5% 56.7% 0.50 51.4%
RP MLB Percentile 26 19 17 27 61 22 61 60 67 65 50 59 26 27 49 49
RP MLB AVG 44.5% 63.7% 47.3% 31.6% 25.6% 18.1% 74.4% 83.8% 58.7% 16.3% 12.1% 28.5% 17.1% 58.2% 0.50 51.0%
Career 43.1% 60.8% 44.0% 29.0% 26.1% 17.0% 73.9% 85.9% 54.2% 16.8% 11.5% 28.3% 15.5% 56.0% 0.47 50.2%

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 42.7% 30.9% 25.5% 43.6% 30.3% 22.9% 46.8% 33.4% 41.1% 6.9%
RP MLB Percentile 26 31 64 79 19 44 80 77 33 68
RP MLB AVG 44.5% 34.7% 27.0% 38.4% 36.4% 22.9% 40.7% 29.9% 43.1% 6.6%
Career 43.1% 31.9% 25.0% 43.1% 28.4% 23.1% 48.5% 32.1% 42.9% 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 56.8% 11.3% 32.8% 15.3% 64.3% 48.7% 22.9% 22.2% 19.0%
RP MLB Percentile 28 59 82 62 73 37 68 15 51
RP MLB AVG 58.5% 12.2% 29.8% 14.5% 60.8% 50.1% 21.1% 26.6% 19.1%
Career 57.8% 13.6% 29.5% 14.1% 61.3% 49.7% 21.5% 23.4% 20.3%

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 769 4.82 45.6% 15.2% 39.1% 6.5% 3.9% -6.8 -7 3.98
RP MLB Percentile 69 18 38 21 21 21 61 86 81 27
RP MLB AVG 648 4.94 45.8% 17.4% 36.8% 9.1% 4.7% 0.7 0 3.47
Career 1,786 4.83 44.9% 16.3% 38.7% 6.2% 4.5% 2.7 -1 3.99
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