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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%
13 24.1 2.96 0.99 27.6% 4.1%
4th 1
Sv
78th 19.0
IP
117th 4.51
ERA
42nd 1.42
WHIP
66th 22.2%
K%
13th 10.6%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.4 14.2% 29.6% 54.1% 3.4% 4.91 3.37
11th 94.3
FB MPH
86th 11.9%
SwStr%
131st 28.5%
CSW%
65th 50.5%
Str-ICR
110th 4.5%
MTK%
192nd 4.93
PLV
155th 3.63
PLA
Saves List
Rank
16th
Saves+Holds List
Rank
26th

Articles

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5/26/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/26Rick Graham

5/25/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/25Rick Graham

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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 24 0 24.1 3-2 13 1 2.96 0.99 3.26 2.49 2.80 3.37 27.6% 4.1% 7.4 0.37 .317 11.1% 68.8% 30.6% 62.3% 14.2% 29.6% 0.55 4.91
RP MLB Percentile 87 0 76 89-11 99 39 67 88 71 88 91 56 81 96 61 79 32 62 39 83 96 75 62 67 44
RP MLB AVG 15 1 19.0 1-1 1 3 4.51 1.42 4.36 4.37 4.34 3.63 22.2% 10.6% 8.5 1.09 .292 17.4% 72.1% 37.0% 44.4% 11.9% 28.5% 0.49 4.93
Career 76 1 82.2 6-4 19 7 3.37 1.29 3.88 3.99 3.90 3.81 24.1% 10.6% 7.5 0.76 .294 20.0% 77.1% 34.1% 56.2% 12.0% 28.1% 0.47 4.86

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 24 0 24.1 3-2 0 13 1 379 243 136 98 20 18 1 0 1 27 4 5 4
RP MLB Percentile 87 0 76 89-11 0 99 39 70 71 30 71 29 14 74 24 51 81 79 2 1
RP MLB AVG 15 1 19.0 1-1 0 1 3 330 209 122 85 18 12 3 0 2 19 9 1 1
Career 76 1 82.2 6-4 0 19 7 1,396 857 540 357 69 52 8 2 7 86 38 13 8

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 27.6% 4.1% .227 .273 .572 .268 .317 .328 .222 .291 .296 .351 85.5 91.8 -0.8 3.26
RP MLB Percentile 81 96 59 81 79 77 32 43 62 71 38 55 83 31 98 71
RP MLB AVG 22.2% 10.6% .241 .388 .719 .322 .292 .321 .236 .323 .283 .364 88.0 89.3 13.0 4.36
Career 24.1% 10.6% .228 .338 .676 .311 .294 .317 .232 .316 .300 .348 85.6 88.6 4.3 3.88

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 CIN 54.8% (91.9) - - - - 23.8% (79.1) 21.4% (88.1) - - 54.8% 45.2%
2022 SEA 47.8% (92.4) - - - - 47.8% (78.0) - - - 47.8% 47.8%
2024 STL 2.1% (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) 17.5% (83.4) 0.1% (90.4) - - 48.3% 51.7%
2026 STL - 57.3% (98.4) - 11.6% (91.5) 30.6% (83.8) - 0.5% (90.5) - - 57.3% 42.7%
RP MLB Percentile - 93 (96) - 17 (98) 71 (68) - 0 (89) - - 78.7% 20.8%
RP MLB AVG 36.7% (94.3) 26.3% (93.9) 21.3% (89.2) 26.2% (85.5) 22.7% (82.4) 17.7% (80.0) 18.3% (86.1) 20.6% (86.4) 31.8% (68.1) 47.9% 52.0%
Career 2.7% (92.5) 48.1% (98.0) - 23.4% (90.2) 10.3% (90.2) 14.5% (82.7) 0.9% (88.7) - - 50.9% 49.1%

Riley O’Brien Pitch › Results

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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 CIN 21.7% (1) - - - - 40.0% (4) 22.2% (2) - - 21.7% 31.6%
2022 SEA 18.2% (0) - - - - 18.2% (1) - - - 18.2% 27.3%
2024 STL 25.0% (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 - 31.8% (23) - 20.5% (5) 29.3% (26) - 0.0% (0) - - 31.8% 26.5%
RP MLB Percentile - 68 (2) - 12 (52) 55 (5) - 0 (0) - - 79.5% 34.6%
RP MLB AVG 26.6% (11) 27.6% (5) 26.8% (6) 29.8% (10) 27.7% (9) 27.2% (6) 22.1% (8) 25.2% (11) 23.3% (6) 28.0% 28.6%
Career 21.1% (2) 26.6% (46) - 30.1% (44) 30.6% (32) 29.6% (41) 16.7% (2) - - 26.3% 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 62.3% 21.3% 14.8% 1.6% 27.9% 46.8% 33.9% 19.4% 18.2% 68.8% 21.3% 6.6% 3.3% 30.6%
RP MLB Percentile 96 49 10 6 78 76 53 22 59 82 68 40 86 83
RP MLB AVG 44.4% 21.3% 24.1% 10.2% 34.1% 41.5% 33.7% 24.8% 17.6% 62.7% 24.1% 6.0% 7.2% 37.0%
Career 56.2% 21.2% 16.1% 6.5% 31.3% 45.9% 29.5% 24.5% 17.6% 65.4% 25.3% 4.6% 4.6% 34.1%

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 .227 .268 .317 .328 .222 .291 .296 .351 85.5 91.8 -0.8 11.1% 30.6% 19.4%
RP MLB Percentile 59 77 32 43 62 71 38 55 83 31 98 62 83 83
RP MLB AVG .241 .322 .292 .321 .236 .323 .283 .364 88.0 89.3 13.0 17.4% 37.0% 24.4%
Career .228 .311 .294 .317 .232 .316 .300 .348 85.6 88.6 4.3 20.0% 34.1% 21.0%

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 43.3% 64.1% 48.8% 33.0% 29.2% 18.2% 70.8% 82.5% 52.1% 15.3% 14.2% 29.6% 16.4% 58.8% 0.55 54.1%
RP MLB Percentile 40 60 69 63 71 59 71 62 74 31 75 62 38 61 67 81
RP MLB AVG 44.3% 63.0% 46.5% 30.8% 25.6% 17.6% 74.4% 83.9% 58.5% 16.6% 11.9% 28.5% 16.9% 57.7% 0.49 50.5%
Career 43.3% 61.4% 45.3% 30.0% 26.5% 17.6% 73.5% 86.1% 52.7% 16.0% 12.0% 28.1% 15.8% 56.4% 0.47 50.6%

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 43.3% 32.5% 24.5% 43.0% 28.5% 20.8% 50.7% 35.9% 39.6% 6.9%
RP MLB Percentile 40 35 72 75 15 69 89 85 27 61
RP MLB AVG 44.3% 34.9% 26.9% 38.2% 36.3% 22.8% 40.9% 30.5% 42.6% 6.5%
Career 43.3% 32.5% 24.6% 42.9% 27.4% 22.6% 50.0% 32.4% 43.0% 6.2%

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 58.0% 9.0% 33.0% 15.0% 68.7% 51.5% 23.2% 25.6% 21.6%
RP MLB Percentile 42 92 83 57 93 62 71 43 68
RP MLB AVG 58.5% 12.8% 29.3% 14.2% 60.0% 49.5% 21.2% 26.4% 19.4%
Career 58.5% 13.6% 28.6% 13.7% 61.6% 50.7% 21.2% 24.8% 21.6%

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 379 4.91 46.7% 16.4% 36.9% 9.8% 3.4% -4.5 -1 3.37
RP MLB Percentile 70 44 54 44 49 49 66 85 65 56
RP MLB AVG 330 4.93 46.2% 16.8% 36.9% 9.3% 4.5% 0.4 +0 3.63
Career 1,396 4.86 45.0% 17.0% 38.0% 7.0% 4.6% 5.1 +5 3.81
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