P | St. Louis Cardinals
Bats/Throws: R/R | 6' 4" 180 lbs | Age: 31
Draft: 2017 | Rd. 8, No. 229, Tampa Bay Rays | College of Idaho
W L ERA G GS SV IP SO WHIP
2024 0 0 11.25 8 0 0 8 11 2.63
2025 3 1 2.06 42 0 6 48 45 1.15
2026 2 0 0.00 10 0 5 10.1 11 0.39
5 Seasons 5 2 3.01 62 1 11 68.2 70 1.27
G W-L ERA IP SO WHIP
2024 8 0-0 11.25 8 11 2.63
2025 42 3-1 2.06 48 45 1.15
2026 10 2-0 0.00 10.1 11 0.39
5 Seasons 62 5-2 3.01 68.2 70 1.27
MLB Percentile Rankings
Movement Profile (Induced Break)
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Statcast Statistics

Season Age Pitches Batted
Balls
Barrels Barrel % Barrel/PA Exit
Velocity
Max EV Launch
Angle
LA Sweet-
Spot %
xBA xSLG wOBA xwOBA xwOBAcon HardHit% K% BB% ERA xERA
2021 26 42 4 2 50.0 22.2 88.8 111.5 -9.5 50.0 .333 1.100 .676 .624 .885 50.0 22.2 33.3 13.50 28.84
2022 27 23 3 0 0.0 0.0 98.5 105.1 -23.0 0.0 .136 .136 .315 .240 .170 66.7 20.0 20.0 0.00 2.31
2024 29 194 26 2 7.7 4.3 89.0 112.3 17.7 42.3 .282 .428 .467 .383 .437 42.3 23.9 17.4 11.25 6.35
2025 30 758 125 4 3.2 2.0 85.8 108.8 4.8 27.2 .234 .306 .270 .298 .319 34.4 22.6 11.1 2.06 3.66
2026 31 135 23 0 0.0 0.0 82.3 105.9 -11.2 4.3 .157 .189 .136 .169 .225 26.1 31.4 0.0 0.00 1.15
Player 1152 181 8 4.4 2.7 86.1 112.3 3.8 26.5 .231 .324 .298 .305 .334 35.4 23.8 11.6
MLB 7.2 4.9 88.6 122.9 12.4 33.3 .243 .408 .315 .316 .369 37.0 22.2 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

O'Brien relies on 4 pitches.
Sinker
(58.5%) ,
Sweeper
(24.4%) ,
Slider
(16.3%) ,
Changeup
(0.7%) ,


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Pitch Tracking



Batted Ball Profile

AIR: Fly Balls + Line Drives + Popups All Batted Balls Batted Ball Breakdown
Season GB % AIR % FB % LD % PU % Pull % Straight % Oppo % Pull GB % Straight GB % Oppo GB % Pull AIR % Straight AIR % Oppo AIR %
2021 50.0 50.0 25.0 25.0 0.0 25.0 75.0 0.0 0.0 50.0 0.0 25.0 25.0 0.0
2022 100.0 0.0 0.0 0.0 0.0 0.0 100.0 0.0 0.0 100.0 0.0 0.0 0.0 0.0
2024 38.5 61.5 30.8 23.1 7.7 61.5 26.9 11.5 30.8 7.7 0.0 30.8 19.2 11.5
2025 55.2 44.8 15.2 24.0 5.6 37.6 36.0 26.4 23.2 26.4 5.6 14.4 9.6 20.8
2026 73.9 26.1 13.0 13.0 0.0 56.5 30.4 13.0 43.5 17.4 13.0 13.0 13.0 0.0
Player 55.8 44.2 17.1 22.1 5.0 42.5 35.9 21.5 26.0 24.3 5.5 16.6 11.6 16.0
MLB 44.2 55.8 24.1 24.6 7.1 37.4 37.3 25.1 20.7 17.6 5.9 16.7 19.7 19.3
! Note: All figures in this table cover the period 2015-present.

Quality of Contact

Season Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2021 0.0 50.0 0.0 0.0 0.0 50.0 22.2
2022 0.0 100.0 0.0 0.0 0.0 0.0 0.0
2024 0.0 26.9 26.9 34.6 3.8 7.7 4.3
2025 11.2 36.0 16.8 27.2 4.0 3.2 2.0
2026 17.4 56.5 13.0 8.7 4.3 0.0 0.0
Player 9.9 38.7 17.1 24.9 3.9 4.4 2.7
MLB 4.0 32.4 24.9 24.4 5.9 7.2 4.9
! Note: All figures in this table cover the period 2015-present.

Pitch Movement


How this works: This section shows two different ways to evaluate pitch movement. On the left, “Total Movement” shows the real-world movement of a pitch, including the forces of gravity, which affects every pitch thrown. Since gravity requires time, and slower pitches aren't 'better' just because they have more time to move, a pitch's movement is compared to other pitches of the same pitch type, within +/- 2 MPH and +/- 0.5 feet of extension/release. On the right, Induced Movement (or IVB) is reported without gravity, and attempts to isolate movement created by the pitcher's ability to spin and manipulate the ball.
Total Movement (in inches, w/ gravity)Induced Movement (in inches, w/o gravity)
YearPitchTeamHand#MPHVertical
Drop
vs.
Comparable
Horizontal
Break
vs.
Comparable
Vertical
Break
vs. AvgHorizontal
Break
vs. Avg
2026 Sinker STL R 79 97.8 24.2 3.4 16.9ARM 1.0 4.6 3.1 16.9ARM 1.3
2026 Changeup STL R 1 90.4 27.2 -3.1 16.1ARM 1.5 6.5 -2.6 16.1ARM 1.3
2026 Slider STL R 22 91.1 28.2 -1.5 2.5GLV -0.8 4.6 -3.2 2.5GLV -1.6
2026 Sweeper STL R 33 83.2 43.2 5.3 17.1GLV 2.8 -3.4 4.7 17.1GLV 3.0
2025 Changeup STL R 1 90.4 28.9 -1.0 16.5ARM 1.8 4.4 -0.3 16.5ARM 2.0
2025 Slider STL R 230 90.1 30.2 -0.6 3.7GLV 0.1 3.2 -1.4 3.7GLV -0.6
2025 Sweeper STL R 161 83.4 41.8 3.7 16.7GLV 3.1 -2.3 3.3 16.7GLV 2.7
2025 Sinker STL R 366 98.0 22.3 1.6 15.9ARM 0.7 6.1 1.3 15.9ARM 0.8
! Note: Years are in reverse order.

Run Values by Pitch Type

Year Pitch Type Team RV/100 Run Value Pitches % PA BA SLG wOBA Whiff% K% PutAway % xBA xSLG xwOBA Hard Hit %
2026 Sinker 6.6 5 79 58.5 25 .120 .120 .108 28.2 24.0 28.6 .188 .206 .175 21.1
2026 Sweeper 0.6 0 33 24.4 3 .000 .000 .000 38.5 100.0 18.8 -- -- .000 --
2026 Slider 2.3 1 22 16.3 7 .167 .333 .279 23.1 28.6 33.3 .105 .214 .215 50.0
2026 Changeup -5.5 0 1 0.7 -- -- -- -- -- -- -- -- -- --
2025 Sinker 1.6 6 366 48.3 108 .228 .272 .289 10.8 12.0 16.7 .287 .362 .346 34.2
2025 Slider 0.6 1 230 30.3 48 .238 .357 .288 29.6 27.1 28.9 .242 .321 .277 35.5
2025 Sweeper 1.0 2 161 21.2 40 .059 .176 .186 50.7 47.5 23.2 .081 .139 .185 33.3
2025 Changeup -4.1 0 1 0.1 -- -- -- -- -- -- -- -- -- --
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.

Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2026 Sinker 77 97.8 81 18.2 1:30 2:30 -60
2026 Slider 22 91.1 23 5.0 12:00 10:45 75
2026 Sweeper 32 83.2 67 18.8 8:00 8:30 -30
2025 Sinker 366 98.0 85 17.5 1:30 2:30 -60
2025 Slider 230 90.1 24 5.0 11:15 10:00 75
2025 Sweeper 161 83.4 67 18.2 8:00 8:30 -30
! Note: Years are in reverse order.
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! Note: This table is showing data from the PITCHER perspective.
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Pitcher Arm Angle

! Note: Data is available from 2020 through the present.
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Statcast Pitching Run Value

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2021 9 42 -2 0 0 0 -3
2022 5 23 0 0 0 0 0
2024 46 194 -2 -1 -2 -2 -7
2025 196 758 11 6 -4 -5 9
2026 35 135 3 4 0 -1 6
Player 291 1,152 10 10 -6 10 5
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Plate Discipline

Season Pitches Zone % Zone Swing % Zone Contact % Chase % Chase Contact % Edge % 1st Pitch Strike % Swing % Whiff % Meatball % Meatball Swing %
2021 42 33.3 71.4 90.0 28.6 25.0 33.3 66.7 42.9 38.9 4.8 50.0
2022 23 56.5 76.9 80.0 10.0 100.0 43.5 60.0 47.8 18.2 8.7 100.0
2024 194 44.3 62.8 79.6 21.3 56.5 36.1 45.7 39.7 27.3 8.8 82.4
2025 758 47.4 63.0 88.5 29.1 50.0 46.0 61.9 45.1 24.6 6.5 81.6
2026 135 43.7 66.1 82.1 34.2 53.8 32.6 77.1 48.1 29.2 5.9 87.5
Player 1,152 46.1 63.8 86.1 28.0 50.6 42.3 61.3 44.5 25.9 6.8 82.1
MLB 48.8 67.0 82.6 28.5 58.0 42.7 61.1 47.3 25.0 7.4 76.2
! Note: All figures in this table cover the period 2015-present.

Percentile Rankings

Run Value Pitching
Year Pitching Fastball Breaking Off
Speed
xERA Fastball
MPH
Fastball
Spin
Curve
Spin
Avg
EV
Chase% Whiff% K% BB% Barrel% Hard-
Hit%
GB% Extension
2021
2022
2024 89 17 93
2025 95 24 90
2026 95 98 68 44 99 92 36 98 80 68 86 97 89 92 99 83
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Expected Home Runs

Adjusted

Year Team Avg HR Trot Actual HR xHR HR-xHR Doubters Mostly Gone No Doubters No Doubter %
2021 22.48 2 1.7 0 0 1 1 50.0
2024 25.68 2 2.0 0 0 1 1 50.0
2025 24.63 2 1.4 1 0 1 1 50.0
2026 -- 0 0.5 -1 0 1 0 --
Player 24.26 6 5.5 1 0 4 3 50.0
Note: xHR tells how many of this pitcher's batted balls allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
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Expected Home Runs by Park

Adjusted

Year HR
2021 2 2 2 1 1 2 2 1 1 1 1 1 2 2 2 2 2 2 2 1 2 2 2 2 2 2 1 2 2 2 2
2024 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1
2025 2 2 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 2 1 2 1 1 1 2 2 2 1 2 2 1 2
2026 0 1 0 1 1 1 1 1 1 0 0 1 0 1 1 1 0 0 0 1 0 0 1 1 0 0 1 0 0 0 0
Player 6 7 5 5 5 6 6 5 5 4 4 5 5 7 6 6 6 6 5 6 5 5 6 7 6 6 5 6 6 5 5
Note: xHR tells how many of this pitcher's batted balls allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
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Year to Year Changes

2026 +/-   2025 +/-   2024 +/-   2023 +/-   2022 +/-   2021
Results
BA .118 -.078 .196 -.165 .361 -- -- -- -- -.083 .333
xBA .157 -.077 .234 -.048 .282 -- -- -- -- -.197 .333
OBP .143 -.170 .313 -.165 .478 -- -- -- -- -.156 .556
xOBP .181 -.165 .346 -.075 .421 -- -- -- -- -.247 .555
SLG .147 -.127 .274 -.365 .639 -- -- -- -- -1.083 1.333
xSLG .189 -.117 .306 -.122 .428 -- -- -- -- -.964 1.100
ISO .029 -.048 .077 -.201 .278 -- -- -- -- -1.000 1.000
xISO .032 -.041 .073 -.073 .146 -- -- -- -- -.766 .767
BABIP .174 -.080 .254 -.204 .458 -- -- -- -- +.333 .000
wOBA .136 -.134 .270 -.197 .467 -- -- -- -- -.361 .676
xwOBA .169 -.129 .298 -.085 .383 -- -- -- -- -.384 .624
wOBAcon .174 -.100 .274 -.313 .587 -- -- -- -- -.708 1.003
xwOBAcon .225 -.094 .319 -.118 .437 -- -- -- -- -.715 .885
BACON .174 -.092 .266 -.234 .500 -- -- -- -- -.167 .500
xBACON .232 -.086 .318 -.081 .399 -- -- -- -- -.319 .500
Statcast Hit Metrics
Hard Hit % 26.1 -8.3 34.4 -7.9 42.3 -- -- -- -- +16.7 50.0
Avg Exit Velocity 82.3 -3.5 85.8 -3.2 89.0 -- -- -- -- +9.7 88.8
Launch Angle Sweet-Spot % 4.3 -22.9 27.2 -15.1 42.3 -- -- -- -- -50.0 50.0
Barrel % 0.0 -3.2 3.2 -4.5 7.7 -- -- -- -- -50.0 50.0
Avg Launch Angle -11.2 -16.0 4.8 -12.9 17.7 -- -- -- -- -13.5 -9.5
Statcast Bat Tracking
Bat Speed 71.8 +1.3 70.5 +1.1 69.4 -- -- -- -- -- --
Attack Angle 10° +1° +2° -- -- -- -- -- --
Ideal Attack Angle % 51.7 +2.6 49.1 +15.2 33.9 -- -- -- -- -- --
Attack Direction -1° -1° -- -- -- -- -- --
Swing Path - Tilt 34° +1° 33° -1° 33° -- -- -- -- -- --
Swing Length 7.5 +0.3 7.2 +0.2 7.0 -- -- -- -- -- --
Statcast Pitch Metrics
Fastball Velocity 97.8 -0.2 98.0 +1.2 96.8 -- -- -- -- +0.5 91.9
Breaking Velocity 86.4 -0.9 87.3 +1.1 86.2 -- -- -- -- -1.0 79.1
Offspeed Velocity 90.4 0.0 90.4 -- -- -- -- -- -- -- 88.1
Batted Ball Results
Barrels 0 -4 4 +2 2 -- -- -- -- -2 2
Popup % 0.0 -5.6 5.6 -2.1 7.7 -- -- -- -- 0.0 0.0
Flyball % 13.0 -2.2 15.2 -15.6 30.8 -- -- -- -- -25.0 25.0
Line Drive % 13.0 -11.0 24.0 +0.9 23.1 -- -- -- -- -25.0 25.0
Groundball % 73.9 +18.7 55.2 +16.7 38.5 -- -- -- -- +50.0 50.0
Pull % 56.5 +18.9 37.6 -23.9 61.5 -- -- -- -- -25.0 25.0
Straight Away % 30.4 -5.6 36.0 +9.1 26.9 -- -- -- -- +25.0 75.0
Opposite Field % 13.0 -13.4 26.4 +14.9 11.5 -- -- -- -- 0.0 0.0
Weak Contact % 17.4 +6.2 11.2 +11.2 0.0 -- -- -- -- 0.0 0.0
Pull Airball % 13.0 -1.4 14.4 -16.4 30.8 -- -- -- -- -25.0 25.0
Topped Contact % 56.5 +20.5 36.0 +9.1 26.9 -- -- -- -- +50.0 50.0
Under Contact % 13.0 -3.8 16.8 -10.1 26.9 -- -- -- -- 0.0 0.0
Flare/Burner Contact % 8.7 -18.5 27.2 -7.4 34.6 -- -- -- -- 0.0 0.0
Solid Contact % 4.3 +0.3 4.0 +0.2 3.8 -- -- -- -- 0.0 0.0
HR/FB % 0.0 -10.5 10.5 -14.5 25.0 -- -- -- -- -- 200.0
Popups 0 -7 7 +5 2 -- -- -- -- 0 0
Flyballs 3 -16 19 +11 8 -- -- -- -- -1 1
Line Drives 3 -27 30 +24 6 -- -- -- -- -1 1
Groundballs 17 -52 69 +59 10 -- -- -- -- +1 2
Plate Discipline
In Zone % 43.7 -3.7 47.4 +3.1 44.3 -- -- -- -- +23.2 33.3
Out of Zone % 56.3 +3.7 52.6 -3.1 55.7 -- -- -- -- -23.2 66.7
Edge % 32.6 -13.4 46.0 +9.9 36.1 -- -- -- -- +10.2 33.3
Zone Swing % 66.1 +3.1 63.0 +0.2 62.8 -- -- -- -- +5.5 71.4
Out of Zone Swing % 34.2 +5.1 29.1 +7.8 21.3 -- -- -- -- -18.6 28.6
In Zone Contact % 82.1 -6.4 88.5 +8.9 79.6 -- -- -- -- -10.0 90.0
Out of Zone Contact % 53.8 +3.8 50.0 -6.5 56.5 -- -- -- -- +75.0 25.0
Whiff % 29.2 +4.6 24.6 -2.7 27.3 -- -- -- -- -20.7 38.9
First Strike % 77.1 +15.2 61.9 +16.2 45.7 -- -- -- -- -6.7 66.7
First Pitch Swing % 42.9 +11.9 31.0 +4.9 26.1 -- -- -- -- +37.8 22.2
Swing % 48.1 +3.0 45.1 +5.4 39.7 -- -- -- -- +4.9 42.9
Meatball Swing % 87.5 +5.9 81.6 -0.8 82.4 -- -- -- -- +50.0 50.0
Meatball % 5.9 -0.6 6.5 -2.3 8.8 -- -- -- -- +3.9 4.8
Zone Swing & Miss % 17.9 +6.4 11.5 -8.9 20.4 -- -- -- -- +10.0 10.0
Out of Zone Swing & Miss % 46.2 -3.8 50.0 +6.5 43.5 -- -- -- -- -75.0 75.0
In Zone 59 -300 359 +273 86 -- -- -- -- -1 14
Out of Zone 76 -323 399 +291 108 -- -- -- -- -18 28
Edge 44 -305 349 +279 70 -- -- -- -- -4 14
In Zone Swings 39 -187 226 +172 54 -- -- -- -- 0 10
Out of Zone Swings 26 -90 116 +93 23 -- -- -- -- -7 8
In Zone Swing & Misses 7 -19 26 +15 11 -- -- -- -- +1 1
Out of Zone Swing & Misses 12 -46 58 +48 10 -- -- -- -- -6 6
Basic
Pitches 135 -623 758 +564 194 -- -- -- -- -19 42
PA 35 -164 199 +153 46 -- -- -- -- -4 9
AB 34 -134 168 +132 36 -- -- -- -- -2 6
Hits 4 -29 33 +20 13 -- -- -- -- -1 2
Singles 3 -22 25 +17 8 -- -- -- -- +1 0
Doubles 1 -4 5 +3 2 -- -- -- -- 0 0
Triples 0 -1 1 0 1 -- -- -- -- 0 0
Home Runs 0 -2 2 0 2 -- -- -- -- -2 2
Walks 0 -22 22 +14 8 -- -- -- -- -2 3
Strikeouts 11 -34 45 +34 11 -- -- -- -- -1 2
K% 31.4 +8.8 22.6 -1.3 23.9 -- -- -- -- -2.2 22.2
BB% 0.0 -11.1 11.1 -6.3 17.4 -- -- -- -- -13.3 33.3
HBP 1 -6 7 +6 1 -- -- -- -- 0 0
Batted Balls 23 -102 125 +99 26 -- -- -- -- -1 4
Number of Fastballs 79 -287 366 +273 93 -- -- -- -- -12 23
Number of Offspeed 1 0 1 +1 0 -- -- -- -- -9 9
Number of Breaking 22 -208 230 +180 50 -- -- -- -- 0 0
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2021 Shifts 9 .676 4 0 0.0 5 3 60.0
2022 Shifts 5 .315 2 1 50.0 3 3 100.0
2024 Shades 46 .467 26 0 0.0 20 15 75.0
2025 Shades 197 .270 114 0 0.0 83 42 50.6
2026 Shades 35 .136 11 0 0.0 24 6 25.0
! Note: Shifts are through the 2022 season, Shaded starting from the 2023 season, Shift: three or more infielders are on the same side of second base, Shade: positioned outside of their typical responsible slices of the field.
Learn more about how positioning is defined here

Pitch Tempo

Bases EmptyRunners On Base
SeasonTeamPitchesTempoFast %Slow %PitchesTempoFast %Slow %
2021 14 16.5 28.6% 0.0% 7 21.4 0.0% 0.0%
2022 9 16.1 22.2% 0.0% 2 16.9 0.0% 0.0%
2024 35 15.5 28.6% 0.0% 54 17.7 3.7% 1.9%
2025 219 15.8 29.7% 0.9% 118 18.0 1.7% 0.0%
2026 28 17.1 17.9% 0.0% 15 18.4 0.0% 0.0%

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Pitch Distribution