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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%
16 28.1 3.81 1.16 25.2% 5.9%
4th 1
Sv
93rd 22.0
IP
179th 4.46
ERA
80th 1.40
WHIP
90th 22.2%
K%
26th 10.5%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.3 13.4% 28.4% 51.8% 4.6% 4.83 3.80
13th 94.2
FB MPH
86th 12.0%
SwStr%
185th 28.5%
CSW%
117th 50.5%
Str-ICR
187th 4.5%
MTK%
255th 4.93
PLV
208th 3.65
PLA
Saves List
Rank
19th
Saves+Holds List
Rank
25th

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6/4/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/4Rick 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 28 0 28.1 3-3 16 1 3.81 1.16 3.91 2.72 3.24 3.80 25.2% 5.9% 8.3 0.32 .333 8.3% 65.6% 33.8% 59.2% 13.4% 28.4% 0.50 4.83
RP MLB Percentile 84 0 72 84-5 98 36 49 77 56 87 89 41 74 92 52 85 29 75 20 69 93 74 46 53 26
RP MLB AVG 17 1 22.0 1-1 1 3 4.46 1.40 4.32 4.33 4.36 3.65 22.2% 10.5% 8.5 1.08 .290 17.4% 72.0% 37.2% 43.7% 12.0% 28.5% 0.49 4.93
Career 80 1 86.2 6-5 22 7 3.63 1.34 4.06 4.00 4.00 3.93 23.5% 10.8% 7.8 0.73 .301 18.4% 75.5% 34.9% 55.6% 11.9% 27.8% 0.46 4.84

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 28 0 28.1 3-3 0 16 1 461 291 170 119 26 23 2 0 1 30 7 5 5
RP MLB Percentile 84 0 72 84-5 0 98 36 71 69 29 71 28 13 63 27 62 75 68 2 1
RP MLB AVG 17 1 22.0 1-1 0 1 3 384 243 141 98 21 14 4 0 3 22 10 1 1
Career 80 1 86.2 6-5 0 22 7 1,478 905 574 378 75 57 9 2 7 89 41 13 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 25.2% 5.9% .248 .295 .617 .286 .333 .342 .249 .315 .317 .372 85.8 89.8 0.3 3.91
RP MLB Percentile 74 92 49 81 76 73 29 37 40 56 20 39 84 46 98 56
RP MLB AVG 22.2% 10.5% .241 .388 .717 .319 .290 .319 .236 .321 .282 .362 87.9 89.5 13.4 4.32
Career 23.5% 10.8% .235 .342 .685 .313 .301 .322 .240 .321 .306 .354 85.8 88.2 4.3 4.06

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 - 57.5% (98.3) - 11.9% (91.3) 29.7% (83.7) - 0.9% (89.9) - - 57.5% 42.5%
RP MLB Percentile - 92 (95) - 17 (98) 71 (66) - 0 (85) - - 78.3% 21.7%
RP MLB AVG 37.2% (94.2) 26.1% (93.9) 21.7% (89.3) 26.1% (85.4) 22.3% (82.4) 17.5% (79.8) 18.2% (86.2) 19.9% (86.5) 31.8% (68.1) 47.5% 52.4%
Career 2.6% (92.5) 48.7% (98.0) - 22.8% (90.2) 11.2% (90.2) 13.7% (82.7) 0.9% (88.8) - - 51.3% 48.6%

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 - 29.8% (26) - 23.6% (6) 28.5% (30) - 0.0% (0) - - 29.8% 26.5%
RP MLB Percentile - 58 (2) - 21 (53) 51 (5) - 0 (0) - - 61.4% 35.1%
RP MLB AVG 26.9% (13) 27.6% (6) 26.8% (7) 29.5% (12) 28.2% (10) 26.5% (7) 21.9% (9) 24.5% (12) 23.3% (6) 28.0% 28.6%
Career 21.1% (2) 26.3% (49) - 30.3% (45) 29.7% (36) 29.6% (41) 14.3% (2) - - 26.0% 29.8%

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 59.2% 22.4% 15.8% 2.6% 31.6% 39.0% 36.4% 24.7% 18.0% 65.7% 23.7% 5.3% 5.3% 33.8%
RP MLB Percentile 93 33 11 5 62 46 62 39 63 67 56 47 63 69
RP MLB AVG 43.7% 21.5% 24.4% 10.4% 34.5% 41.5% 33.5% 25.0% 17.6% 62.5% 24.4% 5.9% 7.3% 37.2%
Career 55.6% 21.6% 16.4% 6.5% 32.3% 43.4% 30.6% 26.0% 17.5% 64.7% 25.9% 4.3% 5.2% 34.9%

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 .248 .286 .333 .342 .249 .315 .317 .372 85.8 89.8 0.3 8.3% 33.8% 21.8%
RP MLB Percentile 49 73 29 37 40 56 20 39 84 46 98 75 69 69
RP MLB AVG .241 .319 .290 .319 .236 .321 .282 .362 87.9 89.5 13.4 17.4% 37.2% 24.6%
Career .235 .313 .301 .322 .240 .321 .306 .354 85.8 88.2 4.3 18.4% 34.9% 21.7%

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 41.6% 63.1% 48.2% 33.5% 27.9% 18.0% 72.1% 84.8% 53.3% 15.0% 13.4% 28.4% 16.7% 57.5% 0.50 51.8%
RP MLB Percentile 22 50 71 72 69 63 69 51 68 20 74 46 41 51 53 65
RP MLB AVG 44.2% 63.1% 46.6% 31.0% 25.7% 17.6% 74.4% 84.0% 58.3% 16.5% 12.0% 28.5% 17.0% 57.7% 0.49 50.5%
Career 42.8% 61.2% 45.3% 30.3% 26.3% 17.5% 73.7% 86.7% 53.1% 15.9% 11.9% 27.8% 15.9% 56.2% 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 41.6% 34.1% 25.6% 40.3% 29.3% 21.7% 49.0% 36.4% 38.0% 7.8%
RP MLB Percentile 22 41 59 67 18 69 88 90 18 73
RP MLB AVG 44.2% 34.6% 26.9% 38.5% 36.4% 22.7% 41.0% 30.3% 42.8% 6.5%
Career 42.8% 33.0% 24.9% 42.0% 27.7% 22.7% 49.6% 32.8% 42.3% 6.6%

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 57.0% 10.6% 32.3% 15.6% 67.5% 50.0% 21.3% 25.5% 20.1%
RP MLB Percentile 32 84 85 55 90 49 53 40 60
RP MLB AVG 58.5% 12.6% 29.4% 14.2% 60.1% 49.6% 21.1% 26.4% 19.2%
Career 58.1% 13.9% 28.6% 14.0% 61.6% 50.3% 20.7% 24.8% 21.0%

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 461 4.83 45.3% 14.8% 39.9% 5.4% 4.6% -4.2 +1 3.80
RP MLB Percentile 71 26 45 17 20 20 45 84 52 41
RP MLB AVG 384 4.93 46.0% 16.9% 37.0% 9.0% 4.5% 0.4 0 3.65
Career 1,478 4.84 44.7% 16.4% 38.9% 5.8% 4.9% 5.3 +7 3.93
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