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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%
19 33.1 4.05 1.20 23.1% 7.7%
4th 2
Sv
95th 27.0
IP
194th 4.37
ERA
121st 1.39
WHIP
141st 22.1%
K%
104th 10.2%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
98.3 12.8% 28.2% 51.2% 4.2% 4.82 3.90
15th 94.5
FB MPH
110th 12.0%
SwStr%
184th 28.4%
CSW%
148th 50.5%
Str-ICR
163rd 4.6%
MTK%
283rd 4.93
PLV
245th 3.57
PLA
Saves List
Rank
20th
Saves+Holds List
Rank
50th

Articles

6/23/2026Fantasy Baseball Relief Pitcher Roundup: 6/22Rick Graham

6/23/20262026-Top 400 Dynasty Rankings v3.0Martin Sekulski

6/22/2026Fantasy Baseball Relief Pitcher Roundup: 6/21Rick Graham

6/17/2026Fantasy Baseball Relief Pitcher Roundup: 6/16Rick Graham

6/16/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 6/16Rick 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 33 0 33.1 3-3 19 1 4.05 1.20 4.35 3.44 3.81 3.90 23.1% 7.7% 7.8 0.54 .303 12.5% 67.1% 32.3% 56.5% 12.8% 28.2% 0.47 4.82
RP MLB Percentile 82 0 71 79-7 98 33 46 64 48 76 72 31 60 69 51 76 33 67 30 81 92 68 47 44 19
RP MLB AVG 21 1 27.0 2-1 2 4 4.37 1.39 4.34 4.36 4.40 3.57 22.1% 10.2% 8.5 1.12 .294 18.5% 72.4% 37.5% 43.6% 12.0% 28.4% 0.49 4.93
Career 85 1 91.2 6-5 25 7 3.73 1.34 4.21 4.19 4.16 3.96 22.9% 11.2% 7.7 0.79 .292 19.0% 75.5% 34.3% 54.8% 11.7% 27.8% 0.45 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 33 0 33.1 3-3 0 19 1 549 341 208 143 29 24 3 0 2 33 11 6 5
RP MLB Percentile 82 0 71 79-7 0 98 33 71 69 25 75 28 16 57 32 51 72 40 1 1
RP MLB AVG 21 1 27.0 2-1 0 2 4 462 293 169 118 25 17 5 0 3 26 12 2 1
Career 85 1 91.2 6-5 0 25 7 1,566 955 612 402 78 58 10 2 8 92 45 14 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 23.1% 7.7% .236 .309 .635 .294 .303 .319 .251 .329 .310 .370 86.3 91.1 0.6 4.35
RP MLB Percentile 60 69 49 76 68 63 33 45 42 48 29 45 76 33 97 48
RP MLB AVG 22.1% 10.2% .245 .396 .726 .321 .294 .324 .239 .322 .282 .364 87.8 89.4 13.2 4.34
Career 22.9% 11.2% .231 .344 .687 .314 .292 .315 .241 .325 .304 .354 85.9 88.9 4.2 4.21

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 - 58.3% (98.3) - 10.6% (91.3) 30.2% (83.7) - 0.9% (90.2) - - 58.3% 41.7%
RP MLB Percentile - 93 (96) - 14 (98) 75 (67) - 0 (88) - - 80.6% 19.4%
RP MLB AVG 37.4% (94.5) 25.4% (94.0) 21.2% (89.3) 26.2% (85.2) 21.5% (82.6) 17.8% (79.6) 17.9% (86.2) 19.5% (86.5) 31.8% (68.1) 47.9% 51.9%
Career 2.4% (92.5) 49.5% (98.0) - 21.7% (90.2) 12.4% (90.2) 13.0% (82.7) 1.0% (89.0) - - 51.9% 48.0%

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 - 30.0% (30) - 24.1% (6) 27.1% (34) - 0.0% (0) - - 30.0% 25.8%
RP MLB Percentile - 63 (2) - 22 (55) 44 (6) - 0 (87) - - 69.9% 27.8%
RP MLB AVG 26.8% (16) 27.2% (7) 27.3% (8) 29.7% (14) 28.0% (12) 27.1% (8) 21.5% (11) 23.9% (14) 23.3% (6) 27.6% 28.8%
Career 21.1% (2) 26.6% (53) - 30.3% (45) 28.4% (40) 29.6% (41) 13.3% (2) - - 26.3% 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 56.5% 22.8% 17.4% 3.3% 30.4% 39.8% 37.6% 22.6% 16.9% 67.4% 22.8% 4.3% 5.4% 32.3%
RP MLB Percentile 92 44 17 3 74 42 70 38 35 80 65 62 63 81
RP MLB AVG 43.6% 22.0% 24.2% 10.3% 34.6% 41.2% 33.7% 25.1% 17.8% 62.1% 24.7% 6.0% 7.2% 37.5%
Career 54.8% 21.8% 16.9% 6.5% 31.9% 43.4% 31.5% 25.1% 17.2% 65.3% 25.4% 4.0% 5.2% 34.3%

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 .236 .294 .303 .319 .251 .329 .310 .370 86.3 91.1 0.6 12.5% 32.3% 21.0%
RP MLB Percentile 49 63 33 45 42 48 29 45 76 33 97 67 81 81
RP MLB AVG .245 .321 .294 .324 .239 .322 .282 .364 87.8 89.4 13.2 18.5% 37.5% 24.9%
Career .231 .314 .292 .315 .241 .325 .304 .354 85.9 88.9 4.2 19.0% 34.3% 21.4%

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 41.7% 62.1% 46.6% 31.9% 27.3% 16.9% 72.7% 85.7% 52.9% 15.5% 12.8% 28.2% 16.9% 56.8% 0.47 51.2%
RP MLB Percentile 18 33 49 56 67 35 67 40 77 26 68 47 47 33 44 58
RP MLB AVG 44.5% 63.3% 46.9% 31.1% 25.5% 17.8% 74.5% 83.8% 58.7% 16.4% 12.0% 28.4% 17.1% 57.8% 0.49 50.5%
Career 42.8% 61.0% 45.0% 29.9% 26.1% 17.2% 73.9% 86.9% 53.0% 16.0% 11.7% 27.8% 16.0% 56.0% 0.45 50.0%

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 41.7% 34.1% 25.3% 40.6% 28.6% 22.0% 49.4% 34.2% 40.4% 7.5%
RP MLB Percentile 18 50 65 62 17 56 87 85 29 81
RP MLB AVG 44.5% 34.6% 27.0% 38.4% 36.3% 22.9% 40.9% 30.1% 42.9% 6.5%
Career 42.8% 33.1% 24.9% 42.0% 27.5% 22.8% 49.6% 32.2% 42.9% 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 57.4% 10.2% 32.4% 16.5% 67.4% 49.3% 21.9% 23.6% 18.5%
RP MLB Percentile 38 78 78 75 91 48 52 28 53
RP MLB AVG 58.5% 12.4% 29.6% 14.4% 60.5% 49.7% 21.1% 26.2% 19.1%
Career 58.2% 13.5% 28.9% 14.4% 61.9% 50.0% 21.0% 24.1% 20.4%

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 549 4.82 45.2% 15.8% 39.0% 6.2% 4.2% -4.3 -1 3.90
RP MLB Percentile 71 19 39 27 24 24 53 79 53 31
RP MLB AVG 462 4.93 45.9% 17.2% 36.9% 9.0% 4.6% 0.9 +0 3.57
Career 1,566 4.83 44.7% 16.7% 38.6% 6.1% 4.7% 5.2 +5 3.96
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