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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 12.1 7.30 1.62 28.1% 8.8%
160th 1
Sv
288th 24.0
IP
288th 4.43
ERA
231st 1.40
WHIP
26th 22.2%
K%
177th 10.4%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.7 12.8% 30.1% 50.7% 5.9% 5.06 3.31
56th 94.3
FB MPH
82nd 11.9%
SwStr%
86th 28.5%
CSW%
94th 50.4%
Str-ICR
305th 4.6%
MTK%
90th 4.93
PLV
136th 3.50
PLA
Holds List
Rank
23rd
Saves+Holds List
Rank
44th

Articles

6/10/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/10Rick Graham

6/9/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 6/9Rick Graham

6/9/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/9Rick Graham

6/8/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/8Rick Graham

6/7/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 6/7Rick 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 14 0 12.1 0-3 0 7 7.30 1.62 4.08 6.00 3.62 3.31 28.1% 8.8% 10.9 2.92 .344 40.0% 62.5% 44.4% 44.4% 12.8% 30.1% 0.58 5.06
RP MLB Percentile 30 0 17 0-6 0 83 18 33 69 24 87 61 92 50 29 7 30 5 18 21 54 75 75 85 72
RP MLB AVG 19 1 24.0 1-1 1 3 4.43 1.40 4.32 4.31 4.36 3.50 22.2% 10.4% 8.5 1.08 .293 17.6% 71.8% 37.4% 43.6% 11.9% 28.5% 0.49 4.93
Career 94 0 101.2 8-9 5 27 3.90 1.11 3.11 3.37 3.50 2.66 23.7% 5.7% 7.9 0.97 .277 16.9% 64.3% 38.2% 47.3% 15.0% 29.0% 0.53 5.13

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 14 0 12.1 0-3 0 0 7 219 143 76 57 15 10 1 0 4 16 5 0 0
RP MLB Percentile 30 0 17 0-6 0 0 83 18 20 86 18 76 75 81 29 26 33 78 64 53
RP MLB AVG 19 1 24.0 1-1 0 1 3 402 255 148 103 22 14 4 0 3 23 10 1 1
Career 94 0 101.2 8-9 0 5 27 1,529 1,022 507 418 89 67 10 1 11 99 24 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 28.1% 8.8% .288 .538 .889 .386 .344 .417 .220 .320 .247 .410 89.5 95.4 8.2 4.08
RP MLB Percentile 92 50 39 21 28 28 30 14 78 69 78 32 39 13 90 69
RP MLB AVG 22.2% 10.4% .242 .391 .720 .320 .293 .322 .238 .323 .284 .365 87.9 89.4 13.2 4.32
Career 23.7% 5.7% .229 .344 .619 .274 .277 .304 .221 .277 .261 .336 88.4 91.4 10.0 3.11

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 30.6% (96.7) 2.3% (97.4) 49.3% (93.0) - 15.5% (86.2) 2.3% (84.9) - - - 32.9% 67.1%
RP MLB Percentile 35 (82) 2 (89) 94 (93) - 37 (90) 3 (88) - - - 9.1% 90.7%
RP MLB AVG 37.5% (94.3) 25.6% (93.9) 21.6% (89.4) 26.2% (85.4) 21.9% (82.5) 17.6% (79.8) 18.4% (86.2) 19.8% (86.5) 31.8% (68.1) 47.6% 52.2%
Career 31.7% (96.5) 0.3% (97.4) 38.3% (92.1) - 19.0% (-) 10.7% (84.6) - - - 32.0% 68.0%

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 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 22.4% (9) 0.0% (0) 33.3% (9) - 35.3% (10) 60.0% (0) - - - 20.8% 34.7%
RP MLB Percentile 22 (52) 0 (86) 76 (26) - 83 (36) 99 (79) - - - 9.6% 87.5%
RP MLB AVG 26.9% (14) 27.4% (6) 27.1% (7) 29.3% (12) 28.2% (11) 27.0% (7) 21.8% (10) 24.4% (13) 23.3% (6) 27.9% 28.6%
Career 27.1% (70) 0.0% (0) 31.2% (68) - 29.3% (65) 27.0% (26) - - - 26.8% 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 44.4% 22.2% 27.8% 5.6% 38.9% 50.0% 30.6% 19.4% 18.7% 55.6% 27.8% 5.6% 11.1% 44.4%
RP MLB Percentile 54 21 61 6 12 90 44 10 80 24 21 36 53 21
RP MLB AVG 43.6% 21.8% 24.2% 10.3% 34.7% 41.4% 33.6% 25.1% 17.7% 62.3% 24.7% 5.9% 7.2% 37.4%
Career 47.3% 21.2% 22.3% 9.2% 32.9% 42.1% 37.3% 20.5% 18.7% 61.7% 25.3% 7.5% 5.5% 38.2%

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 .288 .386 .344 .417 .220 .320 .247 .410 89.5 95.4 8.2 40.0% 44.4% 28.1%
RP MLB Percentile 39 28 30 14 78 69 78 32 39 13 90 5 21 46
RP MLB AVG .242 .320 .293 .322 .238 .323 .284 .365 87.9 89.4 13.2 17.6% 37.4% 24.7%
Career .229 .274 .277 .304 .221 .277 .261 .336 88.4 91.4 10.0 16.9% 38.2% 26.8%

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 53.0% 65.3% 47.9% 25.2% 26.7% 18.7% 73.3% 79.7% 53.8% 17.4% 12.8% 30.1% 16.4% 58.4% 0.58 50.7%
RP MLB Percentile 98 80 75 15 70 80 70 83 88 51 75 75 26 74 85 73
RP MLB AVG 44.4% 63.2% 46.7% 31.0% 25.5% 17.7% 74.5% 84.0% 58.5% 16.5% 11.9% 28.5% 17.0% 57.8% 0.49 50.4%
Career 48.5% 66.8% 52.8% 34.4% 28.3% 18.7% 71.7% 82.7% 49.8% 14.0% 15.0% 29.0% 19.2% 61.0% 0.53 52.2%

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 53.0% 24.2% 36.1% 39.7% 37.9% 20.1% 42.0% 25.1% 38.8% 9.6%
RP MLB Percentile 98 4 1 59 61 73 50 14 17 97
RP MLB AVG 44.4% 34.6% 26.9% 38.5% 36.2% 22.8% 41.0% 30.1% 43.0% 6.5%
Career 48.5% 22.6% 33.3% 44.0% 32.7% 19.7% 47.6% 29.5% 37.2% 7.0%

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 60.3% 11.4% 28.3% 17.4% 61.4% 52.6% 23.5% 19.4% 25.8%
RP MLB Percentile 46 55 51 82 68 77 61 8 93
RP MLB AVG 58.5% 12.6% 29.5% 14.3% 60.3% 49.7% 21.2% 26.2% 19.2%
Career 61.0% 11.2% 28.2% 17.3% 62.4% 48.0% 17.7% 26.2% 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 5.19 49.5% 18.0% 32.5% 17.0% 4.2% -1.2 +3 2.41
2026 BOS 219 5.06 44.7% 23.3% 32.0% 12.8% 5.9% 4.9 +1 3.31
RP MLB Percentile 18 72 38 97 90 90 12 33 63 61
RP MLB AVG 402 4.93 46.0% 17.0% 37.0% 9.1% 4.6% 0.6 +0 3.50
Career 1,529 5.13 47.5% 19.4% 33.1% 14.5% 4.8% -0.2 +14 2.66
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