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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%
37 62.0 4.21 1.31 23.0% 10.8%
2nd 3
Sv
94th 49.0
IP
184th 4.25
ERA
142nd 1.35
WHIP
145th 22.5%
K%
228th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
97.7 11.8% 29.3% 49.7% 4.7% 4.79 4.08
28th 94.7
FB MPH
181st 12.1%
SwStr%
134th 28.5%
CSW%
216th 51.1%
Str-ICR
181st 4.7%
MTK%
289th 4.94
PLV
272nd 3.57
PLA
Saves List
Rank
17th
Saves+Holds List
Rank
84th

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9/13/2026Fantasy Baseball Relief Pitcher Roundup: 9/12Rick Graham

9/13/2026Arroyo Collects First MLB Home Run in M's Win - Fantasy Hitting Recap 9/12/26Kevin O'Brien

9/12/2026Fantasy Baseball Relief Pitcher Roundup: 9/11Rick Graham

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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 64 0 62.0 3-9 37 1 4.21 1.31 4.70 4.03 4.30 4.08 23.0% 10.8% 7.5 0.73 .294 14.7% 67.9% 36.9% 49.7% 11.8% 29.3% 0.50 4.79
RP MLB Percentile 87 0 73 54-1 99 19 48 59 34 66 53 23 58 35 63 81 47 73 30 51 79 48 61 51 16
RP MLB AVG 39 2 49.0 3-3 3 7 4.25 1.35 4.21 4.23 4.29 3.57 22.5% 9.8% 8.3 1.11 .291 17.5% 72.5% 36.9% 43.8% 12.1% 28.5% 0.50 4.94
Career 116 1 120.1 6-11 43 7 3.89 1.36 4.43 4.32 4.33 4.04 22.9% 11.9% 7.6 0.82 .289 18.3% 73.8% 36.2% 51.7% 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 64 0 62.0 3-9 0 37 1 1,046 644 402 269 52 37 10 0 5 62 29 10 7
RP MLB Percentile 87 0 73 54-1 0 99 19 73 72 20 76 29 24 27 47 57 74 19 1 2
RP MLB AVG 39 2 49.0 3-3 0 3 7 835 534 301 214 45 30 8 1 6 48 20 3 2
Career 116 1 120.1 6-11 0 43 7 2,063 1,258 806 528 101 71 17 2 11 121 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 23.0% 10.8% .230 .341 .683 .307 .294 .315 .245 .333 .304 .373 87.3 89.2 5.2 4.70
RP MLB Percentile 58 35 62 81 69 65 47 57 46 34 25 43 64 60 92 34
RP MLB AVG 22.5% 9.8% .241 .390 .714 .315 .291 .321 .235 .315 .280 .358 87.7 89.2 13.2 4.21
Career 22.9% 11.9% .230 .352 .699 .316 .289 .314 .241 .328 .303 .359 86.5 88.4 5.8 4.43

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-58.7% (97.7)-7.7% (90.6)32.4% (82.9)-1.2% (91.0)-- 58.7% 41.3%
RP MLB Percentile - 95 (91) - 8 (97) 81 (57) - 1 (93) - - 77.1% 22.0%
RP MLB AVG 38.5% (94.7) 26.6% (94.0) 19.7% (89.4) 25.8% (86.0) 21.0% (82.4) 15.5% (80.3) 17.2% (86.1) 18.6% (86.6) 42.7% (61.5) 48.6% 51.2%
Career1.8% (92.5)51.8% (97.8)-17.6% (90.1)17.8% (82.9)9.8% (82.7)1.1% (89.8)-- 53.7% 46.3%

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-29.6% (45)-24.7% (9)29.8% (67)-33.3% (2)-- 29.6% 28.9%
RP MLB Percentile - 63 (5) - 21 (66) 55 (2) - 91 (77) - - 68.9% 52.8%
RP MLB AVG 27.0% (30) 27.4% (12) 26.9% (14) 29.7% (26) 28.3% (19) 27.0% (14) 22.0% (19) 22.2% (20) 19.3% (9) 27.9% 28.8%
Career21.1% (2)27.3% (68)-30.0% (48)30.2% (73)29.6% (41)27.3% (4)-- 27.1% 29.9%

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 49.7% 25.1% 20.4% 4.8% 36.5% 34.5% 38.1% 27.4% 16.2% 62.9% 23.4% 7.2% 6.6% 36.9%
RP MLB Percentile 79 17 21 5 40 16 83 62 21 52 59 24 58 51
RP MLB AVG 43.8% 21.7% 24.3% 10.2% 34.7% 41.0% 33.6% 25.4% 18.2% 62.8% 24.6% 5.9% 6.8% 36.9%
Career 51.7% 23.2% 18.6% 6.5% 34.7% 39.9% 33.1% 27.0% 16.7% 63.6% 25.1% 5.6% 5.9% 36.2%

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 .230 .307 .294 .315 .245 .333 .304 .373 87.3 89.2 5.2 14.7% 36.9% 23.0%
RP MLB Percentile 62 65 47 57 46 34 25 43 64 60 92 73 51 66
RP MLB AVG .241 .315 .291 .321 .235 .315 .280 .358 87.7 89.2 13.2 17.5% 36.9% 24.5%
Career .230 .316 .289 .314 .241 .328 .303 .359 86.5 88.4 5.8 18.3% 36.2% 22.3%

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 43.0% 61.6% 44.0% 30.2% 26.7% 16.2% 73.3% 86.8% 52.2% 17.6% 11.8% 29.3% 16.1% 56.6% 0.50 49.7%
RP MLB Percentile 28 21 18 40 60 21 60 27 79 71 48 61 27 29 51 38
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.5% 18.2% 74.5% 84.0% 58.6% 16.4% 12.1% 28.5% 17.1% 58.3% 0.50 51.1%
Career 43.2% 61.0% 44.0% 29.5% 26.1% 16.7% 73.9% 87.2% 52.6% 17.0% 11.5% 28.5% 15.8% 56.1% 0.47 49.5%

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 43.0% 29.9% 26.0% 44.1% 28.3% 23.0% 48.7% 33.2% 40.8% 6.9%
RP MLB Percentile 28 23 63 84 14 47 86 80 29 57
RP MLB AVG 44.5% 34.5% 27.0% 38.5% 36.3% 22.9% 40.8% 29.9% 43.1% 6.6%
Career 43.2% 31.2% 25.3% 43.5% 27.6% 23.1% 49.2% 32.2% 42.5% 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 57.2% 11.9% 32.0% 14.9% 62.5% 48.4% 23.1% 23.6% 18.5%
RP MLB Percentile 26 53 80 51 56 33 71 22 45
RP MLB AVG 58.5% 12.1% 30.0% 14.6% 61.1% 50.2% 21.2% 26.8% 19.2%
Career 57.9% 13.6% 29.5% 14.1% 60.8% 49.3% 21.8% 24.0% 19.9%

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 1,046 4.79 44.9% 15.4% 39.7% 5.3% 4.7% -4.4 -6 4.08
RP MLB Percentile 73 16 37 23 20 20 46 83 83 23
RP MLB AVG 835 4.94 45.9% 17.4% 36.7% 9.1% 4.7% 0.7 0 3.57
Career 2,063 4.82 44.7% 16.3% 39.1% 5.6% 4.8% 5.1 0 4.04
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