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Justin Slaten

#63 - Relief Pitcher

Boston Red Sox

Bats / Throws Right / Right
Date of Birth 9/15/1997 (28)
Height, Weight 6'4", 222 lb
Hometown Longview, TX

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 3.1 0.00 1.20 35.7% 14.3%
57th 0
Sv
227th 5.0
IP
1st 5.07
ERA
112th 1.50
WHIP
30th 23.0%
K%
191st 10.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.4 12.5% 28.6% 55.4% 7.1% 5.03 3.07
53rd 94.3
FB MPH
120th 12.2%
SwStr%
147th 29.1%
CSW%
69th 49.6%
Str-ICR
248th 3.8%
MTK%
126th 4.99
PLV
123rd 3.52
PLA
Holds List
Rank
35th
Saves+Holds List
Rank
54th

Articles

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Justin Slaten Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
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
2024 BOS 44 0 55.1 6-2 2 13 2.93 1.01 2.77 2.60 2.96 2.67 25.9% 4.0% 7.6 0.65 .285 13.3% 70.6% 38.1% 50.6% 15.5% 29.3% 0.55 5.12
2025 BOS 36 0 34.0 2-4 3 7 4.24 1.09 3.29 3.69 4.34 2.40 18.2% 7.3% 7.1 0.79 .242 12.0% 54.9% 36.3% 43.1% 15.0% 27.9% 0.48 5.20
2026 BOS 4 0 3.1 0-1 0 2 0.00 1.20 1.73 1.86 3.83 3.07 35.7% 14.3% 5.4 0.00 .286 0.0% 75.0% 28.6% 28.6% 12.5% 28.6% 0.57 5.03
RP MLB Percentile 31 0 17 0-2 0 81 75 58 88 84 54 56 89 29 70 42 44 46 46 77 17 56 47 62 54
RP MLB AVG 4 0 5.0 0-0 0 1 5.07 1.50 4.71 5.28 4.68 3.52 23.0% 10.8% 8.8 1.24 .282 17.7% 72.7% 38.6% 44.0% 12.2% 29.1% 0.50 4.99
Career 84 0 92.2 8-7 5 22 3.30 1.05 2.93 2.98 3.50 2.59 23.5% 5.6% 7.4 0.68 .268 12.1% 65.0% 37.1% 47.1% 15.2% 28.8% 0.53 5.14

Justin Slaten Repertoire

2024 2025 2026 All
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Justin Slaten Game Log

Justin Slaten 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
2024 BOS 44 0 55.1 6-2 0 2 13 811 546 265 224 47 36 6 1 4 58 9 2 4
2025 BOS 36 0 34.0 2-4 0 3 7 499 333 166 137 27 21 3 0 3 25 10 0 1
2026 BOS 4 0 3.1 0-1 0 0 2 56 35 21 14 2 2 0 0 0 5 2 0 0
RP MLB Percentile 31 0 17 0-2 0 0 81 16 16 77 14 71 52 54 5 42 48 38 19 21
RP MLB AVG 4 0 5.0 0-0 0 0 1 88 55 33 22 5 3 1 0 1 5 2 0 0
Career 84 0 92.2 8-7 0 5 22 1,366 914 452 375 76 59 9 1 7 88 21 2 5

Justin Slaten Advanced

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Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2024 BOS 25.9% 4.0% .223 .318 .577 .253 .285 .303 .214 .259 .264 .326 87.6 89.4 8.9 2.77
2025 BOS 18.2% 7.3% .214 .310 .580 .251 .242 .265 .231 .277 .261 .313 89.1 92.3 12.3 3.29
2026 BOS 35.7% 14.3% .167 .167 .453 .231 .286 .286 .133 .209 .228 .215 88.5 87.0 12.4 1.73
RP MLB Percentile 89 29 71 83 77 74 44 57 87 88 71 86 49 67 53 88
RP MLB AVG 23.0% 10.8% .233 .376 .698 .315 .282 .314 .234 .322 .280 .373 88.4 89.5 13.2 4.71
Career 23.5% 5.6% .218 .309 .573 .259 .268 .288 .217 .272 .262 .328 88.2 90.5 10.3 2.93

Justin Slaten 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%
2024 BOS 29.2% (96.4) - 37.7% (91.5) - 24.5% (84.0) 8.4% (84.3) - - - 29.2% 70.7%
2025 BOS 36.1% (96.7) - 34.5% (92.7) - 11.4% (85.1) 18.0% (84.9) - - - 36.1% 63.9%
2026 BOS 19.6% (96.4) - 53.6% (91.9) - 25.0% (85.4) 1.8% (84.6) - - - 19.6% 80.4%
RP MLB Percentile 19 (75) - 94 (82) - 60 (80) 0 (80) - - - 3.9% 96.1%
RP MLB AVG 35.5% (94.3) 29.7% (93.9) 21.4% (89.3) 28.0% (85.5) 24.5% (82.5) 20.9% (81.3) 19.6% (86.3) 22.5% (86.7) - (-) 47.5% 52.3%
Career 31.3% (96.5) - 37.2% (91.9) - 19.8% (-) 11.6% (84.6) - - - 31.3% 68.6%

Justin Slaten 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%
2024 BOS 29.1% (33) - 29.4% (40) - 28.6% (42) 32.4% (11) - - - 29.1% 29.5%
2025 BOS 26.1% (28) - 33.1% (19) - 28.1% (13) 21.1% (15) - - - 26.1% 28.8%
2026 BOS 27.3% (2) - 26.7% (1) - 28.6% (4) 100.0% (0) - - - 27.3% 28.9%
RP MLB Percentile 46 (57) - 47 (48) - 42 (28) 99 (0) - - - 47.3% 49.1%
RP MLB AVG 27.1% (4) 26.7% (2) 26.9% (2) 33.0% (4) 31.9% (3) 29.0% (3) 24.0% (3) 24.8% (4) - (-) 28.0% 29.4%
Career 27.8% (63) - 30.5% (60) - 28.5% (59) 26.4% (26) - - - 27.8% 29.2%

Justin Slaten 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
2024 BOS 50.6% 20.8% 19.5% 9.1% 31.2% 44.2% 35.7% 20.1% 18.9% 61.6% 27.3% 7.1% 3.9% 38.1%
2025 BOS 43.1% 21.6% 24.5% 10.8% 33.3% 36.3% 42.2% 21.6% 18.4% 63.8% 21.6% 8.8% 5.9% 36.3%
2026 BOS 28.6% 28.6% 42.9% 0.0% 42.9% 85.7% 0.0% 14.3% 21.4% 71.5% 14.3% 14.3% 0.0% 28.6%
RP MLB Percentile 17 23 88 0 25 99 0 17 82 75 77 11 64 77
RP MLB AVG 44.0% 21.0% 25.4% 9.7% 34.9% 41.0% 34.1% 24.9% 16.7% 61.8% 23.8% 5.9% 8.5% 38.6%
Career 47.1% 21.3% 22.1% 9.5% 32.3% 42.2% 37.3% 20.5% 18.8% 62.8% 24.7% 8.0% 4.6% 37.1%

Justin Slaten 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%
2024 BOS .223 .253 .285 .303 .214 .259 .264 .326 87.6 89.4 8.9 13.3% 38.1% 26.3%
2025 BOS .214 .251 .242 .265 .231 .277 .261 .313 89.1 92.3 12.3 12.0% 36.3% 27.0%
2026 BOS .167 .231 .286 .286 .133 .209 .228 .215 88.5 87.0 12.4 0.0% 28.6% 14.3%
RP MLB Percentile 71 74 44 57 87 88 71 86 49 67 53 46 77 88
RP MLB AVG .233 .315 .282 .314 .234 .322 .280 .373 88.4 89.5 13.2 17.7% 38.6% 25.2%
Career .218 .259 .268 .288 .217 .272 .262 .328 88.2 90.5 10.3 12.1% 37.1% 26.1%

Justin Slaten 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
2024 BOS 46.6% 67.3% 53.5% 37.0% 29.0% 18.9% 71.0% 85.4% 46.3% 13.8% 15.5% 29.3% 19.1% 61.5% 0.55 52.8%
2025 BOS 49.7% 66.7% 53.9% 33.9% 27.9% 18.4% 72.1% 79.9% 55.3% 12.8% 15.0% 27.9% 20.4% 61.3% 0.48 51.9%
2026 BOS 50.0% 62.5% 46.4% 21.4% 26.9% 21.4% 73.1% 85.0% 33.3% 16.1% 12.5% 28.6% 12.5% 58.9% 0.57 55.4%
RP MLB Percentile 83 46 54 15 52 82 52 45 89 42 56 47 14 54 62 75
RP MLB AVG 43.5% 62.7% 45.8% 30.6% 26.6% 16.7% 73.4% 83.4% 56.4% 16.9% 12.2% 29.1% 16.9% 57.5% 0.50 49.6%
Career 47.9% 66.9% 53.4% 35.3% 28.5% 18.8% 71.5% 83.3% 49.0% 13.5% 15.2% 28.8% 19.3% 61.3% 0.53 52.6%

Justin Slaten Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2024 BOS 46.6% 22.5% 33.1% 44.4% 32.5% 19.1% 48.4% 29.8% 37.2% 6.2%
2025 BOS 49.7% 22.2% 32.5% 45.3% 30.7% 20.2% 49.1% 31.1% 36.5% 7.2%
2026 BOS 50.0% 25.0% 37.5% 37.5% 33.9% 23.2% 42.9% 25.0% 37.5% 12.5%
RP MLB Percentile 83 15 4 42 43 48 55 22 27 95
RP MLB AVG 43.5% 35.2% 26.1% 38.7% 36.0% 22.6% 41.4% 30.7% 43.2% 6.4%
Career 47.9% 22.5% 33.0% 44.5% 31.9% 19.7% 48.4% 30.0% 36.9% 6.8%

Justin Slaten Approach › Counts

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Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2024 BOS 60.9% 10.5% 28.7% 18.0% 63.4% 48.2% 17.2% 26.6% 24.9%
2025 BOS 61.5% 12.2% 27.3% 16.0% 61.0% 45.6% 16.0% 28.7% 18.4%
2026 BOS 58.9% 16.1% 25.0% 15.2% 71.4% 64.3% 21.2% 14.3% 35.7%
RP MLB Percentile 58 25 26 68 88 92 50 9 93
RP MLB AVG 58.9% 13.2% 28.6% 13.5% 59.0% 49.3% 21.6% 28.0% 20.6%
Career 61.1% 11.3% 28.0% 17.1% 62.8% 47.9% 16.9% 26.9% 23.0%

Justin Slaten PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2024 BOS 811 5.12 47.1% 19.1% 33.8% 13.3% 4.8% -3.8 +10 2.67
2025 BOS 499 5.20 48.9% 18.4% 32.7% 16.2% 4.4% -1.1 +3 2.40
2026 BOS 56 5.03 46.4% 21.4% 32.1% 14.3% 7.1% -1.0 -2 3.07
RP MLB Percentile 16 54 51 81 74 74 11 75 84 56
RP MLB AVG 88 4.99 46.3% 17.8% 35.8% 10.5% 3.8% 0.6 +1 3.52
Career 1,366 5.14 47.7% 19.0% 33.3% 14.4% 4.8% -5.9 +12 2.59
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