P | Boston Red Sox
Bats/Throws: R/R | 6' 4" 222 lbs | Age: 28
Draft: 2019 | Rd. 3, No. 86, Texas Rangers | New Mexico
W L ERA G GS SV IP SO WHIP
2024 6 2 2.93 44 0 2 55.1 58 1.01
2025 2 4 4.24 36 0 3 34 25 1.09
2026 0 1 0.00 4 0 0 3.1 5 1.20
3 Seasons 8 7 3.30 84 0 5 92.2 88 1.05
G W-L ERA IP SO WHIP
2024 44 6-2 2.93 55.1 58 1.01
2025 36 2-4 4.24 34 25 1.09
2026 4 0-1 0.00 3.1 5 1.20
3 Seasons 84 8-7 3.30 92.2 88 1.05
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
2024 26 811 155 6 3.9 2.7 87.8 112.2 8.6 30.3 .234 .360 .253 .284 .362 36.8 25.9 4.0 2.93 3.25
2025 27 499 102 8 7.8 5.8 89.1 116.2 12.3 32.4 .230 .401 .251 .292 .332 34.3 18.2 7.3 4.24 3.51
2026 28 56 7 0 0.0 0.0 88.5 108.5 12.4 42.9 .175 .234 .231 .254 .305 14.3 35.7 14.3 0.00 2.54
Player 1366 264 14 5.3 3.7 88.3 116.2 10.2 31.4 .231 .370 .252 .286 .349 35.2 23.5 5.6
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

Slaten relies on 4 pitches.
Cutter
(53.6%) ,
Sweeper
(25.0%) ,
Four Seamer
(19.6%) ,
Curveball
(1.8%) ,


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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 %
2024 50.3 49.7 19.4 22.6 7.7 42.6 36.8 20.6 31.0 13.5 5.8 11.6 23.2 14.8
2025 41.2 58.8 27.5 23.5 7.8 40.2 37.3 22.5 26.5 9.8 4.9 13.7 27.5 17.6
2026 28.6 71.4 42.9 28.6 0.0 85.7 0.0 14.3 28.6 0.0 0.0 57.1 0.0 14.3
Player 46.2 53.8 23.1 23.1 7.6 42.8 36.0 21.2 29.2 11.7 5.3 13.6 24.2 15.9
MLB 44.2 55.8 24.1 24.6 7.1 37.4 37.4 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
2024 5.2 35.5 21.3 27.1 7.1 3.9 2.7
2025 2.0 37.3 25.5 21.6 5.9 7.8 5.8
2026 0.0 28.6 42.9 14.3 14.3 0.0 0.0
Player 3.8 36.0 23.5 24.6 6.8 5.3 3.7
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 Sweeper BOS R 14 85.4 36.2 -0.6 15.0GLV 2.1 1.6 -0.3 15.0GLV 1.4
2026 Curveball BOS R 1 84.6 54.1 5.7 5.4GLV -1.3 -15.8 5.4 5.4GLV -3.7
2026 4-Seam Fastball BOS R 11 96.4 12.0 1.0 1.3ARM -5.8 17.6 1.4 1.3ARM -6.4
2026 Cutter BOS R 30 91.9 25.3 -1.5 5.4GLV 3.5 6.9 -1.1 5.4GLV 3.2
2025 Curveball BOS R 90 84.9 54.2 5.6 5.4GLV -1.4 -15.8 5.6 5.4GLV -3.6
2025 4-Seam Fastball BOS R 181 96.7 11.0 2.0 2.1ARM -5.1 18.4 2.6 2.1ARM -5.5
2025 Cutter BOS R 171 92.7 24.0 -1.7 4.7GLV 2.9 7.8 -0.5 4.7GLV 2.5
2025 Sweeper BOS R 57 85.1 38.2 1.1 14.7GLV 1.8 -0.3 1.3 14.7GLV 0.7
! 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 Cutter 1.5 0 30 53.6 5 .250 .250 .320 8.3 0.0 0.0 .262 .382 .363 25.0
2026 Sweeper -1.8 0 14 25.0 5 .250 .250 .320 50.0 40.0 28.6 .264 .319 .344 0.0
2026 4-Seam Fastball 7.3 1 11 19.6 4 .000 .000 .000 33.3 75.0 60.0 .001 .001 .001 0.0
2026 Curveball 6.4 0 1 1.8 -- -- -- -- -- -- -- -- -- --
2025 4-Seam Fastball 1.6 3 181 36.3 48 .163 .186 .230 26.4 22.9 18.0 .160 .276 .239 37.5
2025 Cutter 3.5 6 171 34.3 48 .244 .311 .258 22.9 6.3 30.0 .284 .485 .338 27.9
2025 Curveball -3.1 -3 90 18.0 22 .286 .571 .377 31.9 22.7 11.6 .313 .565 .386 50.0
2025 Sweeper 1.5 1 57 11.4 17 .176 .294 .200 39.4 35.3 27.3 .165 .292 .193 27.3
! 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 Cutter 30 91.9 50 8.3 11:45 10:30 75
2026 4-Seam Fastball 11 96.4 84 17.1 12:30 12:15 15
2026 Sweeper 14 85.4 42 15.9 8:00 9:00 -60
2025 Curveball 89 84.9 78 19.4 6:45 6:30 15
2025 Cutter 171 92.7 52 8.6 11:30 10:45 45
2025 4-Seam Fastball 181 96.7 86 18.1 12:30 12:15 15
2025 Sweeper 56 85.1 49 15.8 8:00 8:45 -45
! 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
2024 224 811 4 9 -3 -2 9
2025 135 499 7 3 -1 -1 7
2026 14 56 1 0 0 -1 1
Player 373 1,366 13 12 -4 13 17
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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 %
2024 811 51.3 71.2 83.1 34.9 44.9 39.5 63.4 53.5 29.0 8.1 72.7
2025 499 54.7 72.9 79.4 31.0 51.4 43.9 61.0 53.9 27.9 8.8 77.3
2026 56 55.4 71.0 77.3 16.0 50.0 39.3 71.4 46.4 26.9 10.7 50.0
Player 1,366 52.7 71.8 81.4 32.8 47.2 41.1 62.8 53.4 28.5 8.5 73.3
MLB 48.8 67.0 82.6 28.4 58.0 42.7 61.1 47.3 25.0 7.4 76.3
! 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
2024 76 87 36 82 86 84 71 76 97 76 72 97 96 67 84 77
2025 86 89 75 86
2026 63 76 34 79 54 3 54 91 23 76 97 15
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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 %
2024 25.90 4 4.4 0 3 3 2 50.0
2025 26.30 3 2.7 0 1 2 1 33.3
Player 26.10 7 7.0 0 4 5 3 42.9
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
2024 4 4 4 4 4 4 5 4 4 3 5 4 6 3 4 3 4 3 4 6 5 6 7 5 3 5 4 5 5 4 4
2025 3 3 1 3 3 3 3 3 3 2 3 2 2 3 3 3 3 3 3 3 2 3 3 3 2 2 3 3 2 3 2
Player 7 7 5 7 7 7 8 7 7 5 8 6 8 6 7 6 7 6 7 9 7 9 10 8 5 7 7 8 7 7 6
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
Results
BA .167 -.047 .214 -.009 .223
xBA .175 -.055 .230 -.004 .234
OBP .286 +.016 .270 +.011 .259
xOBP .293 +.008 .285 +.012 .273
SLG .167 -.143 .310 -.008 .318
xSLG .234 -.167 .401 +.041 .360
ISO .000 -.095 .095 .000 .095
xISO .059 -.112 .171 +.045 .126
BABIP .286 +.044 .242 -.043 .285
wOBA .231 -.020 .251 -.002 .253
xwOBA .254 -.038 .292 +.008 .284
wOBAcon .259 -.019 .278 -.038 .316
xwOBAcon .305 -.027 .332 -.030 .362
BACON .286 +.021 .265 -.038 .303
xBACON .301 +.016 .285 -.039 .324
Statcast Hit Metrics
Hard Hit % 14.3 -20.0 34.3 -2.5 36.8
Avg Exit Velocity 88.5 -0.6 89.1 +1.3 87.8
Launch Angle Sweet-Spot % 42.9 +10.5 32.4 +2.1 30.3
Barrel % 0.0 -7.8 7.8 +3.9 3.9
Avg Launch Angle 12.4 +0.1 12.3 +3.7 8.6
Statcast Bat Tracking
Bat Speed 73.5 +2.2 71.3 +0.2 71.1
Attack Angle -2° 11°
Ideal Attack Angle % 43.5 -10.5 54.0 +3.4 50.6
Attack Direction -5° -4° -1° +2° -2°
Swing Path - Tilt 32° -1° 33° 32°
Swing Length 7.3 +0.1 7.2 -0.1 7.3
Statcast Pitch Metrics
Fastball Velocity 93.1 -1.7 94.8 +1.2 93.6
Breaking Velocity 85.3 +0.3 85.0 +0.9 84.1
Offspeed Velocity 0.0 -- -- -- --
Batted Ball Results
Barrels 0 -8 8 +2 6
Popup % 0.0 -7.8 7.8 +0.1 7.7
Flyball % 42.9 +15.4 27.5 +8.1 19.4
Line Drive % 28.6 +5.1 23.5 +0.9 22.6
Groundball % 28.6 -12.6 41.2 -9.1 50.3
Pull % 85.7 +45.5 40.2 -2.4 42.6
Straight Away % 0.0 -37.3 37.3 +0.5 36.8
Opposite Field % 14.3 -8.2 22.5 +1.9 20.6
Weak Contact % 0.0 -2.0 2.0 -3.2 5.2
Pull Airball % 57.1 +43.4 13.7 +2.1 11.6
Topped Contact % 28.6 -8.7 37.3 +1.8 35.5
Under Contact % 42.9 +17.4 25.5 +4.2 21.3
Flare/Burner Contact % 14.3 -7.3 21.6 -5.5 27.1
Solid Contact % 14.3 +8.4 5.9 -1.2 7.1
HR/FB % 0.0 -10.7 10.7 -2.6 13.3
Popups 0 -8 8 -4 12
Flyballs 3 -25 28 -2 30
Line Drives 2 -22 24 -11 35
Groundballs 2 -40 42 -36 78
Plate Discipline
In Zone % 55.4 +0.7 54.7 +3.4 51.3
Out of Zone % 44.6 -0.7 45.3 -3.4 48.7
Edge % 39.3 -4.6 43.9 +4.4 39.5
Zone Swing % 71.0 -1.9 72.9 +1.7 71.2
Out of Zone Swing % 16.0 -15.0 31.0 -3.9 34.9
In Zone Contact % 77.3 -2.1 79.4 -3.7 83.1
Out of Zone Contact % 50.0 -1.4 51.4 +6.5 44.9
Whiff % 26.9 -1.0 27.9 -1.1 29.0
First Strike % 71.4 +10.4 61.0 -2.4 63.4
First Pitch Swing % 42.9 +4.7 38.2 +0.3 37.9
Swing % 46.4 -7.5 53.9 +0.4 53.5
Meatball Swing % 50.0 -27.3 77.3 +4.6 72.7
Meatball % 10.7 +1.9 8.8 +0.7 8.1
Zone Swing & Miss % 22.7 +2.1 20.6 +3.7 16.9
Out of Zone Swing & Miss % 50.0 +1.4 48.6 -6.5 55.1
In Zone 31 -242 273 -143 416
Out of Zone 25 -201 226 -169 395
Edge 22 -197 219 -101 320
In Zone Swings 22 -177 199 -97 296
Out of Zone Swings 4 -66 70 -68 138
In Zone Swing & Misses 5 -36 41 -9 50
Out of Zone Swing & Misses 2 -32 34 -42 76
Basic
Pitches 56 -443 499 -312 811
PA 14 -123 137 -87 224
AB 12 -114 126 -85 211
Hits 2 -25 27 -20 47
Singles 2 -19 21 -15 36
Doubles 0 -3 3 -3 6
Triples 0 0 0 -1 1
Home Runs 0 -3 3 -1 4
Walks 2 -8 10 +1 9
Strikeouts 5 -20 25 -33 58
K% 35.7 +17.5 18.2 -7.7 25.9
BB% 14.3 +7.0 7.3 +3.3 4.0
HBP 0 0 0 -2 2
Batted Balls 7 -95 102 -53 155
Number of Fastballs 41 -311 352 -191 543
Number of Offspeed 0 0 0 0 0
Number of Breaking 1 -89 90 +22 68
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2024 Shades 224 .253 119 5 4.2 105 71 67.6
2025 Shades 135 .251 76 1 1.3 59 39 66.1
2026 Shades 14 .231 9 1 11.1 5 3 60.0
! 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 %
2024 213 16.5 13.6% 0.5% 94 18.0 2.1% 0.0%
2025 121 15.6 39.7% 0.8% 77 16.6 18.2% 0.0%
2026 9 16.4 22.2% 22.2% 7 18.2 0.0% 0.0%

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Pitch Distribution