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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%
24 39.1 3.43 1.12 23.6% 7.9%
4th 2
Sv
108th 33.0
IP
122nd 4.33
ERA
76th 1.37
WHIP
136th 22.3%
K%
108th 10.0%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.2 12.2% 29.2% 51.2% 4.1% 4.83 3.76
14th 94.4
FB MPH
155th 12.1%
SwStr%
142nd 28.4%
CSW%
159th 50.7%
Str-ICR
141st 4.6%
MTK%
265th 4.93
PLV
221st 3.55
PLA
Saves List
Rank
17th
Saves+Holds List
Rank
51st

Articles

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7/9/2026Fantasy Baseball Relief Pitcher Roundup: 7/8Rick Graham

7/8/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/7Rick Graham

6/29/2026Fantasy Baseball Relief Pitcher Roundup: 6/28Rick Graham

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 39 0 39.1 3-3 24 1 3.43 1.12 4.25 3.31 3.89 3.76 23.6% 7.9% 7.1 0.46 .284 10.0% 70.5% 32.1% 56.2% 12.2% 29.2% 0.49 4.83
RP MLB Percentile 82 0 68 71-13 99 27 65 78 44 79 71 36 60 68 72 86 56 81 39 82 91 55 57 48 23
RP MLB AVG 26 1 33.0 2-2 2 4 4.33 1.37 4.30 4.33 4.38 3.55 22.3% 10.0% 8.4 1.15 .291 18.3% 72.3% 37.2% 43.5% 12.1% 28.4% 0.50 4.93
Career 91 1 97.2 6-5 30 7 3.50 1.30 4.18 4.09 4.17 3.90 23.1% 11.1% 7.4 0.74 .285 17.4% 76.5% 34.1% 54.8% 11.6% 28.2% 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 39 0 39.1 3-3 0 24 1 631 391 240 165 31 25 4 0 2 39 13 7 5
RP MLB Percentile 82 0 68 71-13 0 99 27 67 63 29 69 38 25 53 38 65 68 42 1 2
RP MLB AVG 26 1 33.0 2-2 0 2 4 562 358 204 144 31 20 6 1 4 32 14 2 1
Career 91 1 97.2 6-5 0 30 7 1,648 1,005 644 424 80 59 11 2 8 98 47 15 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 23.6% 7.9% .218 .289 .602 .280 .284 .298 .244 .324 .304 .365 86.3 89.1 0.8 4.25
RP MLB Percentile 60 68 69 88 81 75 56 67 38 44 25 44 72 55 97 44
RP MLB AVG 22.3% 10.0% .243 .394 .720 .318 .291 .322 .238 .320 .282 .362 87.7 89.3 13.3 4.30
Career 23.1% 11.1% .225 .334 .671 .307 .285 .307 .239 .323 .302 .352 86.0 88.2 4.1 4.18

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-59.4% (98.2)-9.5% (91.3)30.0% (83.6)-1.1% (90.9)-- 59.4% 40.6%
RP MLB Percentile - 94 (95) - 13 (98) 76 (65) - 1 (92) - - 80.6% 18.6%
RP MLB AVG 38.0% (94.4) 25.6% (93.9) 20.7% (89.4) 25.7% (85.2) 21.5% (82.5) 16.8% (79.8) 17.2% (86.3) 18.5% (86.4) 32.7% (68.2) 48.3% 51.5%
Career2.3% (92.5)50.4% (98.0)-20.8% (90.2)13.2% (83.5)12.3% (82.7)1.0% (89.4)-- 52.7% 47.3%

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-30.7% (33)-25.0% (7)27.5% (35)-28.6% (2)-- 30.7% 27.0%
RP MLB Percentile - 70 (3) - 26 (56) 46 (9) - 78 (68) - - 76.0% 32.6%
RP MLB AVG 27.0% (20) 26.9% (8) 27.2% (10) 29.2% (16) 28.1% (13) 27.2% (9) 21.5% (12) 23.5% (15) 23.9% (7) 27.7% 28.7%
Career21.1% (2)27.1% (56)-30.4% (46)28.6% (41)29.6% (41)23.5% (4)-- 26.8% 29.5%

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 56.2% 21.9% 19.0% 2.9% 29.5% 38.7% 39.6% 21.7% 16.0% 67.6% 21.9% 4.8% 5.7% 32.1%
RP MLB Percentile 91 47 18 4 79 34 85 24 20 82 69 57 65 82
RP MLB AVG 43.5% 21.8% 24.4% 10.4% 34.7% 41.0% 33.9% 25.1% 18.0% 62.5% 24.4% 5.9% 7.2% 37.2%
Career 54.8% 21.5% 17.6% 6.1% 31.4% 42.8% 32.6% 24.6% 16.8% 65.5% 24.9% 4.2% 5.4% 34.1%

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 .218 .280 .284 .298 .244 .324 .304 .365 86.3 89.1 0.8 10.0% 32.1% 20.6%
RP MLB Percentile 69 75 56 67 38 44 25 44 72 55 97 81 82 82
RP MLB AVG .243 .318 .291 .322 .238 .320 .282 .362 87.7 89.3 13.3 18.3% 37.2% 24.7%
Career .225 .307 .285 .307 .239 .323 .302 .352 86.0 88.2 4.1 17.4% 34.1% 21.2%

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 42.5% 62.0% 45.0% 30.3% 27.1% 16.0% 72.9% 85.6% 52.7% 17.0% 12.2% 29.2% 16.8% 57.1% 0.49 51.2%
RP MLB Percentile 26 29 27 38 61 20 61 38 75 61 55 57 44 36 48 54
RP MLB AVG 44.5% 63.5% 47.1% 31.4% 25.5% 18.0% 74.5% 84.0% 58.5% 16.3% 12.1% 28.4% 17.1% 58.0% 0.50 50.7%
Career 43.0% 61.0% 44.4% 29.4% 26.1% 16.8% 73.9% 86.8% 52.9% 16.6% 11.6% 28.2% 16.0% 56.1% 0.46 50.1%

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 42.5% 33.3% 25.0% 41.7% 28.7% 22.5% 48.8% 34.4% 40.6% 7.1%
RP MLB Percentile 26 39 69 73 14 52 86 84 29 68
RP MLB AVG 44.5% 34.7% 27.0% 38.3% 36.5% 22.9% 40.5% 29.9% 43.1% 6.6%
Career 43.0% 32.8% 24.8% 42.4% 27.6% 23.0% 49.4% 32.4% 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 57.5% 10.6% 31.9% 16.8% 65.7% 48.2% 22.3% 22.9% 19.4%
RP MLB Percentile 33 74 78 79 83 35 65 19 51
RP MLB AVG 58.5% 12.3% 29.7% 14.5% 60.7% 49.9% 21.0% 26.4% 19.2%
Career 58.2% 13.5% 28.8% 14.6% 61.6% 49.5% 21.2% 23.8% 20.6%

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 631 4.83 45.5% 15.2% 39.3% 6.2% 4.1% -6.9 -4 3.76
RP MLB Percentile 67 23 45 22 24 24 58 88 75 36
RP MLB AVG 562 4.93 45.9% 17.3% 36.8% 9.0% 4.6% 0.9 +0 3.55
Career 1,648 4.83 44.8% 16.4% 38.8% 6.1% 4.7% 2.7 +2 3.90
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