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Justin Slaten

#63 - Relief Pitcher

Boston Red Sox

Bats / Throws Right / Right
Date of Birth 9/15/1997 (29)
Height, Weight 6'4", 222 lb
Hometown Longview, TX

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 31.1 4.60 1.37 28.5% 5.8%
221st 3
Sv
268th 52.0
IP
232nd 4.19
ERA
198th 1.34
WHIP
49th 22.7%
K%
29th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 12.8% 29.1% 54.1% 5.5% 5.04 3.06
70th 94.7
FB MPH
121st 12.2%
SwStr%
138th 28.5%
CSW%
63rd 51.2%
Str-ICR
250th 4.7%
MTK%
90th 4.94
PLV
84th 3.56
PLA

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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 3.30 3.69 4.34 2.41 18.2% 7.3% 7.1 0.79 .242 12.0% 54.9% 36.3% 43.1% 15.0% 27.9% 0.48 5.19
2026 BOS 36 0 31.1 2-4 0 17 4.60 1.37 3.04 3.04 3.13 3.06 28.5% 5.8% 10.1 1.15 .369 17.4% 61.5% 36.7% 46.1% 12.8% 29.1% 0.57 5.04
RP MLB Percentile 42 0 22 30-18 0 89 33 40 85 87 92 75 86 91 14 40 5 47 6 50 59 63 59 76 72
RP MLB AVG 42 2 52.0 3-3 3 7 4.19 1.34 4.16 4.17 4.24 3.56 22.7% 9.8% 8.3 1.08 .291 17.6% 72.5% 36.8% 44.0% 12.2% 28.5% 0.50 4.94
Career 116 0 120.2 10-10 5 37 3.73 1.13 2.99 3.02 3.39 2.70 24.5% 5.4% 8.1 0.82 .293 14.1% 63.6% 37.2% 47.2% 14.6% 28.9% 0.54 5.12

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 36 0 31.1 2-4 0 0 17 508 341 167 137 35 25 6 0 4 39 8 0 0
RP MLB Percentile 42 0 22 30-18 0 0 89 20 24 84 23 64 57 59 50 59 36 92 85 78
RP MLB AVG 42 2 52.0 3-3 0 3 7 884 565 319 227 48 32 9 1 6 52 21 3 2
Career 116 0 120.2 10-10 0 5 37 1,818 1,220 598 498 109 82 15 1 11 122 27 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 .278 .261 .314 89.1 92.3 12.3 3.30
2026 BOS 28.5% 5.8% .276 .417 .736 .323 .369 .398 .219 .274 .289 .350 87.0 90.6 8.3 3.04
RP MLB Percentile 86 91 19 34 37 38 5 5 69 85 38 54 65 29 79 85
RP MLB AVG 22.7% 9.8% .241 .389 .712 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 4.16
Career 24.5% 5.4% .235 .343 .621 .273 .293 .316 .220 .270 .269 .330 87.9 90.7 9.7 2.99

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 BOS29.2% (96.4)-37.7% (91.5)-24.5% (84.0)8.4% (84.3)--- 29.2% 70.7%
2025 BOS36.1% (96.7)-34.5% (92.7)-11.4% (85.1)18.0% (84.9)--- 36.1% 63.9%
2026 BOS25.2% (96.6)12.8% (97.3)41.5% (93.6)-17.1% (86.1)3.4% (84.6)--- 38.0% 62.0%
RP MLB Percentile 20 (79) 19 (89) 93 (94) - 46 (91) 8 (89) - - - 21.7% 78.6%
RP MLB AVG 38.7% (94.7) 26.6% (94.1) 19.6% (89.4) 25.9% (86.1) 20.7% (82.3) 15.3% (80.3) 17.7% (86.1) 18.9% (86.6) 42.7% (61.5) 48.7% 51.2%
Career30.0% (96.5)3.6% (97.3)37.9% (92.4)-18.9% (84.7)9.6% (84.6)--- 33.6% 66.4%

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 BOS29.1% (33)-29.4% (40)-28.6% (42)32.4% (11)--- 29.1% 29.5%
2025 BOS26.1% (28)-33.1% (19)-28.1% (13)21.1% (15)--- 26.1% 28.8%
2026 BOS20.3% (16)32.3% (9)32.7% (18)-28.7% (18)41.2% (4)--- 24.4% 32.1%
RP MLB Percentile 7 (66) 83 (46) 82 (29) - 48 (36) 95 (60) - - - 14.6% 77.4%
RP MLB AVG 27.2% (32) 27.6% (13) 26.9% (15) 29.7% (28) 28.4% (20) 27.3% (15) 22.3% (21) 22.6% (21) 19.3% (9) 27.9% 28.8%
Career26.1% (77)32.3% (9)31.3% (77)-28.6% (73)27.4% (30)--- 26.7% 30.0%

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 46.1% 23.6% 25.8% 4.5% 40.4% 37.8% 35.6% 26.7% 20.3% 62.9% 24.7% 7.9% 4.5% 36.7%
RP MLB Percentile 59 29 63 6 11 27 67 60 82 49 47 19 79 50
RP MLB AVG 44.0% 21.7% 24.1% 10.2% 34.6% 40.9% 33.7% 25.4% 18.1% 63.0% 24.5% 5.8% 6.8% 36.8%
Career 47.2% 21.7% 22.6% 8.4% 34.2% 40.2% 37.6% 22.3% 19.1% 62.6% 24.9% 7.8% 4.6% 37.2%

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 .278 .261 .314 89.1 92.3 12.3 12.0% 36.3% 27.0%
2026 BOS .276 .323 .369 .398 .219 .274 .289 .350 87.0 90.6 8.3 17.4% 36.7% 24.1%
RP MLB Percentile 19 38 5 5 69 85 38 54 65 29 79 47 50 52
RP MLB AVG .241 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 17.6% 36.8% 24.4%
Career .235 .273 .293 .316 .220 .270 .269 .330 87.9 90.7 9.7 14.1% 37.2% 25.9%

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 49.4% 67.1% 50.8% 34.2% 25.2% 20.3% 74.8% 84.7% 55.7% 16.3% 12.8% 29.1% 17.7% 60.2% 0.57 54.1%
RP MLB Percentile 93 89 83 73 47 82 47 48 66 47 63 59 60 77 76 82
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.6% 18.1% 74.4% 83.9% 58.5% 16.4% 12.2% 28.5% 17.1% 58.3% 0.50 51.2%
Career 48.2% 67.1% 52.9% 35.4% 27.7% 19.1% 72.3% 83.6% 51.1% 14.2% 14.6% 28.9% 19.1% 61.1% 0.54 52.9%

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% 20.4% 48.9% 31.1% 36.5% 7.2%
2026 BOS 49.4% 28.7% 30.5% 40.7% 36.4% 22.4% 41.1% 30.9% 38.6% 9.1%
RP MLB Percentile 93 14 12 66 51 55 53 59 17 97
RP MLB AVG 44.5% 34.6% 27.0% 38.4% 36.2% 22.9% 40.9% 29.9% 43.1% 6.6%
Career 48.2% 24.2% 32.2% 43.6% 33.1% 20.4% 46.5% 30.4% 37.4% 7.3%

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 60.2% 10.2% 29.5% 18.0% 62.8% 50.4% 21.2% 32.0% 26.0%
RP MLB Percentile 77 81 43 88 61 49 51 89 95
RP MLB AVG 58.5% 12.1% 29.9% 14.5% 61.0% 50.1% 21.1% 26.7% 19.3%
Career 60.9% 10.9% 28.5% 17.4% 62.6% 48.1% 18.0% 28.7% 23.5%

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 5.19 49.5% 18.0% 32.5% 17.0% 4.2% -1.2 +3 2.41
2026 BOS 508 5.04 45.9% 20.3% 33.9% 12.0% 5.5% 2.6 +4 3.06
RP MLB Percentile 20 72 47 90 79 79 25 39 29 75
RP MLB AVG 884 4.94 45.9% 17.3% 36.8% 9.1% 4.7% 0.6 -1 3.56
Career 1,818 5.12 47.4% 19.1% 33.4% 14.0% 4.8% -2.4 +17 2.70
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