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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 30.1 4.75 1.38 28.6% 5.3%
204th 3
Sv
232nd 39.0
IP
223rd 4.29
ERA
178th 1.35
WHIP
37th 22.5%
K%
19th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 12.5% 29.4% 54.0% 5.7% 5.02 3.10
69th 94.7
FB MPH
139th 12.2%
SwStr%
110th 28.5%
CSW%
47th 51.1%
Str-ICR
272nd 4.7%
MTK%
98th 4.94
PLV
89th 3.54
PLA
Holds List
Rank
13th
Saves+Holds List
Rank
31st

Articles

8/7/2026Fantasy Baseball Relief Pitcher Roundup: 8/6Rick Graham

8/4/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 8/4Rick Graham

8/3/2026Fantasy Baseball Relief Pitcher Roundup: 8/2Rick Graham

8/2/2026Fantasy Baseball Relief Pitcher Roundup: 8/1Rick Graham

7/31/2026Waiver Relief: Week 19Alex Kamberis

See More 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 3.30 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 35 0 30.1 2-4 0 17 4.75 1.38 2.95 2.99 3.11 3.10 28.6% 5.3% 10.4 1.19 .378 17.4% 60.4% 36.4% 46.0% 12.5% 29.4% 0.57 5.02
RP MLB Percentile 53 0 33 44-9 0 94 37 47 86 88 94 74 89 94 16 39 4 46 11 51 60 60 67 80 71
RP MLB AVG 31 2 39.0 2-2 3 5 4.29 1.35 4.27 4.29 4.32 3.54 22.5% 9.8% 8.3 1.15 .288 18.1% 72.5% 36.9% 43.7% 12.2% 28.5% 0.50 4.94
Career 115 0 119.2 10-10 5 37 3.76 1.13 2.97 3.01 3.39 2.71 24.5% 5.3% 8.2 0.83 .295 14.1% 63.3% 37.1% 47.2% 14.6% 28.9% 0.54 5.11

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 35 0 30.1 2-4 0 0 17 487 327 160 133 35 25 6 0 4 38 7 0 0
RP MLB Percentile 53 0 33 44-9 0 0 94 31 35 73 34 43 36 52 42 42 54 90 78 70
RP MLB AVG 31 2 39.0 2-2 0 3 5 660 421 239 169 36 24 7 1 5 38 16 2 2
Career 115 0 119.2 10-10 0 5 37 1,797 1,206 591 494 109 82 15 1 11 121 26 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 28.6% 5.3% .282 .427 .748 .327 .378 .407 .219 .271 .287 .349 87.4 90.6 8.6 2.95
RP MLB Percentile 89 94 18 36 43 46 4 4 68 86 41 56 57 28 79 86
RP MLB AVG 22.5% 9.8% .241 .393 .717 .316 .288 .320 .236 .317 .280 .361 87.7 89.2 13.2 4.27
Career 24.5% 5.3% .236 .345 .623 .274 .295 .318 .220 .269 .269 .330 88.0 90.7 9.8 2.97

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 BOS25.3% (96.6)11.7% (97.2)42.7% (93.6)-16.8% (86.1)3.5% (84.6)--- 37.0% 63.0%
RP MLB Percentile 20 (79) 18 (90) 93 (95) - 43 (90) 8 (89) - - - 20.4% 79.9%
RP MLB AVG 37.7% (94.7) 26.2% (93.9) 20.4% (89.4) 25.6% (85.6) 21.3% (82.5) 16.3% (79.8) 17.1% (86.2) 17.8% (86.5) 32.5% (68.2) 48.2% 51.6%
Career30.1% (96.5)3.2% (97.2)38.2% (92.4)-18.8% (84.7)9.7% (84.6)--- 33.2% 66.7%

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 BOS19.5% (14)31.6% (7)33.2% (18)-30.5% (18)41.2% (4)--- 23.3% 32.9%
RP MLB Percentile 7 (59) 75 (41) 83 (22) - 62 (30) 92 (52) - - - 9.9% 87.0%
RP MLB AVG 26.8% (24) 27.3% (10) 26.5% (12) 29.3% (20) 27.9% (16) 27.3% (10) 21.8% (15) 23.2% (17) 22.0% (9) 27.9% 28.8%
Career25.9% (75)31.6% (7)31.5% (77)-29.0% (73)27.4% (30)--- 26.5% 30.2%

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 46.0% 23.0% 26.4% 4.6% 40.2% 37.5% 35.2% 27.3% 19.7% 63.1% 24.1% 8.0% 4.6% 36.4%
RP MLB Percentile 60 40 62 8 15 36 54 63 80 52 44 27 78 51
RP MLB AVG 43.7% 21.7% 24.5% 10.2% 34.8% 41.0% 33.8% 25.3% 18.1% 62.8% 24.3% 5.9% 7.0% 36.9%
Career 47.2% 21.6% 22.7% 8.5% 34.1% 40.1% 37.5% 22.4% 19.0% 62.7% 24.8% 7.9% 4.7% 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 .278 .261 .314 89.1 92.3 12.3 12.0% 36.3% 27.0%
2026 BOS .282 .327 .378 .407 .219 .271 .287 .349 87.4 90.6 8.6 17.4% 36.4% 24.1%
RP MLB Percentile 18 46 4 4 68 86 41 56 57 28 79 46 51 52
RP MLB AVG .241 .316 .288 .320 .236 .317 .280 .361 87.7 89.2 13.2 18.1% 36.9% 24.5%
Career .236 .274 .295 .318 .220 .269 .269 .330 88.0 90.7 9.8 14.1% 37.1% 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 50.3% 67.1% 50.3% 33.1% 24.9% 19.7% 75.1% 85.5% 53.8% 16.8% 12.5% 29.4% 18.1% 60.0% 0.57 54.0%
RP MLB Percentile 95 92 82 73 46 80 46 38 73 64 60 67 65 80 80 86
RP MLB AVG 44.5% 63.7% 47.4% 31.6% 25.6% 18.1% 74.4% 83.8% 58.6% 16.3% 12.2% 28.5% 17.1% 58.3% 0.50 51.1%
Career 48.5% 67.1% 52.8% 35.1% 27.6% 19.0% 72.4% 83.8% 50.5% 14.4% 14.6% 28.9% 19.2% 61.0% 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 50.3% 28.1% 31.2% 40.7% 36.3% 21.8% 41.9% 30.6% 38.2% 9.2%
RP MLB Percentile 95 10 8 69 51 74 62 62 13 97
RP MLB AVG 44.5% 34.6% 26.9% 38.5% 36.4% 22.9% 40.7% 29.8% 43.2% 6.6%
Career 48.5% 23.9% 32.4% 43.7% 33.0% 20.2% 46.8% 30.3% 37.2% 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 61.2% 9.4% 29.4% 18.1% 63.2% 50.4% 21.8% 30.8% 26.6%
RP MLB Percentile 81 94 55 89 75 56 68 83 95
RP MLB AVG 58.5% 12.2% 29.8% 14.4% 60.8% 50.1% 21.1% 26.7% 19.2%
Career 61.2% 10.7% 28.5% 17.5% 62.7% 48.1% 18.1% 28.3% 23.6%

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 487 5.02 46.0% 19.9% 34.1% 11.9% 5.7% 2.8 +5 3.10
RP MLB Percentile 31 71 47 87 78 78 22 41 22 74
RP MLB AVG 660 4.94 45.9% 17.4% 36.7% 9.2% 4.7% 0.6 0 3.54
Career 1,797 5.11 47.5% 19.0% 33.5% 14.0% 4.9% -2.2 +18 2.71
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