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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 24.2 5.11 1.46 30.3% 5.5%
191st 2
Sv
248th 35.0
IP
262nd 4.28
ERA
253rd 1.35
WHIP
23rd 22.4%
K%
32nd 9.9%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 12.5% 30.0% 52.8% 5.9% 5.04 3.14
69th 94.5
FB MPH
137th 12.1%
SwStr%
113th 28.5%
CSW%
106th 50.9%
Str-ICR
198th 4.6%
MTK%
89th 4.94
PLV
102nd 3.52
PLA
Holds List
Rank
21st
Saves+Holds List
Rank
39th

Articles

7/22/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/21Rick Graham

7/18/2026Fantasy Baseball Relief Pitcher Roundup: 7/17Rick Graham

7/15/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/14Rick Graham

7/12/2026Fantasy Baseball Relief Pitcher Roundup: 7/11Rick Graham

7/10/2026Fantasy Baseball Relief Pitcher Roundup: 7/9Rick Graham

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 28 0 24.2 1-4 0 14 5.11 1.46 3.30 3.27 3.15 3.14 30.3% 5.5% 10.9 1.46 .406 20.0% 62.5% 40.0% 42.9% 12.5% 30.0% 0.59 5.04
RP MLB Percentile 47 0 28 25-8 0 93 23 25 82 77 92 71 93 91 8 25 1 35 12 33 57 60 67 76 72
RP MLB AVG 27 1 35.0 2-2 2 5 4.28 1.35 4.31 4.33 4.37 3.52 22.4% 9.9% 8.3 1.16 .289 18.4% 72.6% 37.1% 43.6% 12.1% 28.5% 0.50 4.94
Career 108 0 114.0 9-10 5 34 3.79 1.13 3.04 3.07 3.41 2.70 24.7% 5.3% 8.2 0.87 .296 14.7% 64.0% 37.9% 46.6% 14.7% 29.1% 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 28 0 24.2 1-4 0 0 14 407 271 136 109 30 21 5 0 4 33 6 0 0
RP MLB Percentile 47 0 28 25-8 0 0 93 28 30 75 29 46 44 45 39 37 50 88 75 64
RP MLB AVG 27 1 35.0 2-2 0 2 5 591 377 215 152 32 21 6 1 4 34 14 2 1
Career 108 0 114.0 9-10 0 5 34 1,717 1,150 567 470 104 78 14 1 11 116 25 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 30.3% 5.5% .297 .465 .801 .349 .406 .441 .228 .283 .302 .372 87.5 91.2 9.9 3.30
RP MLB Percentile 93 91 9 17 21 19 1 1 63 82 31 41 64 30 78 82
RP MLB AVG 22.4% 9.9% .241 .393 .717 .316 .289 .320 .237 .319 .281 .362 87.7 89.3 13.3 4.31
Career 24.7% 5.3% .237 .349 .629 .276 .296 .320 .222 .271 .271 .333 88.0 90.8 10.2 3.04

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 BOS26.5% (96.6)10.1% (97.1)43.7% (93.4)-17.0% (86.1)2.7% (84.6)--- 36.6% 63.4%
RP MLB Percentile 23 (80) 16 (89) 94 (95) - 44 (89) 5 (89) - - - 15.7% 84.3%
RP MLB AVG 38.1% (94.5) 25.8% (94.0) 20.7% (89.4) 25.4% (85.4) 21.5% (82.5) 16.2% (79.9) 17.3% (86.3) 18.6% (86.3) 32.3% (68.2) 48.3% 51.5%
Career30.6% (96.5)2.4% (97.1)38.2% (92.3)-18.9% (84.6)9.8% (84.6)--- 33.0% 67.0%

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 BOS20.4% (13)24.4% (3)35.4% (16)-30.4% (16)54.5% (3)--- 21.5% 34.9%
RP MLB Percentile 10 (57) 29 (60) 89 (21) - 60 (30) 99 (56) - - - 5.7% 90.3%
RP MLB AVG 27.0% (21) 27.1% (8) 27.0% (10) 29.1% (17) 28.1% (14) 27.4% (10) 21.8% (13) 23.8% (15) 23.8% (8) 27.8% 28.8%
Career26.3% (74)24.4% (3)32.0% (75)-28.9% (71)27.8% (29)--- 26.1% 30.5%

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 42.9% 24.3% 28.6% 4.3% 42.9% 40.0% 31.4% 28.6% 19.4% 60.0% 25.7% 8.6% 5.7% 40.0%
RP MLB Percentile 57 41 79 4 11 39 36 76 70 34 35 26 61 33
RP MLB AVG 43.6% 21.7% 24.4% 10.3% 34.6% 41.0% 33.9% 25.1% 18.0% 62.6% 24.5% 5.8% 7.1% 37.1%
Career 46.6% 21.8% 23.0% 8.6% 34.4% 40.8% 36.8% 22.4% 18.9% 61.9% 25.2% 8.0% 4.9% 37.9%

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 .297 .349 .406 .441 .228 .283 .302 .372 87.5 91.2 9.9 20.0% 40.0% 25.7%
RP MLB Percentile 9 19 1 1 63 82 31 41 64 30 78 35 33 45
RP MLB AVG .241 .316 .289 .320 .237 .319 .281 .362 87.7 89.3 13.3 18.4% 37.1% 24.6%
Career .237 .276 .296 .320 .222 .271 .271 .333 88.0 90.8 10.2 14.7% 37.9% 26.4%

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 50.6% 66.6% 49.1% 31.3% 25.5% 19.4% 74.5% 84.7% 52.4% 17.4% 12.5% 30.0% 17.2% 59.2% 0.59 52.8%
RP MLB Percentile 94 79 67 53 52 70 52 49 73 66 60 67 48 57 76 69
RP MLB AVG 44.5% 63.6% 47.2% 31.4% 25.7% 18.0% 74.3% 83.8% 58.5% 16.4% 12.1% 28.5% 17.1% 58.1% 0.50 50.9%
Career 48.5% 67.0% 52.6% 34.8% 27.9% 18.9% 72.1% 83.5% 50.0% 14.4% 14.7% 29.1% 19.0% 60.9% 0.54 52.5%

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 50.6% 26.8% 32.4% 40.8% 37.1% 19.9% 43.0% 29.2% 38.3% 8.8%
RP MLB Percentile 94 12 5 63 61 87 60 46 16 93
RP MLB AVG 44.5% 34.6% 26.9% 38.4% 36.4% 23.0% 40.7% 30.0% 43.1% 6.6%
Career 48.5% 23.4% 32.8% 43.8% 33.0% 19.7% 47.3% 30.0% 37.2% 7.1%

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% 9.8% 30.0% 17.6% 62.4% 51.4% 23.3% 27.9% 27.0%
RP MLB Percentile 67 82 57 89 60 55 74 72 95
RP MLB AVG 58.5% 12.3% 29.7% 14.5% 60.9% 50.1% 21.1% 26.5% 19.3%
Career 60.9% 10.8% 28.6% 17.3% 62.5% 48.2% 18.3% 27.5% 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 407 5.04 45.9% 18.9% 35.1% 10.8% 5.9% 4.7 +5 3.14
RP MLB Percentile 28 72 53 74 74 74 42 23 15 71
RP MLB AVG 591 4.94 45.9% 17.4% 36.8% 9.1% 4.6% 0.9 0 3.52
Career 1,717 5.12 47.5% 18.8% 33.7% 13.8% 4.9% -0.3 +18 2.70
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