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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 27.1 4.61 1.35 29.4% 5.0%
199th 2
Sv
239th 37.0
IP
233rd 4.30
ERA
193rd 1.36
WHIP
33rd 22.4%
K%
24th 9.9%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 12.6% 29.6% 54.9% 5.9% 5.02 3.13
71st 94.5
FB MPH
124th 12.1%
SwStr%
101st 28.5%
CSW%
76th 50.9%
Str-ICR
234th 4.7%
MTK%
108th 4.93
PLV
98th 3.50
PLA
Holds List
Rank
11th
Saves+Holds List
Rank
30th

Articles

7/28/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/28Rick Graham

7/28/2026Fantasy Baseball Relief Pitcher Roundup: 7/27Rick Graham

7/27/2026Fantasy Baseball Relief Pitcher Roundup: 7/26Rick Graham

7/24/2026Waiver Relief: Week 18Alex Kamberis

7/23/2026Fantasy Baseball Relief Pitcher Roundup: 7/22Rick 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 31 0 27.1 1-4 0 16 4.61 1.35 2.95 3.11 3.17 3.13 29.4% 5.0% 10.2 1.32 .375 18.2% 63.7% 35.9% 46.2% 12.6% 29.6% 0.59 5.02
RP MLB Percentile 50 0 31 24-9 0 95 34 44 85 81 92 72 91 93 16 32 4 38 14 43 60 64 70 78 68
RP MLB AVG 29 2 37.0 2-2 2 5 4.30 1.36 4.29 4.31 4.34 3.50 22.4% 9.9% 8.3 1.15 .289 18.1% 72.5% 36.9% 43.7% 12.1% 28.5% 0.50 4.93
Career 111 0 116.2 9-10 5 36 3.70 1.11 2.97 3.04 3.41 2.70 24.6% 5.2% 8.1 0.85 .292 14.3% 64.3% 37.0% 47.3% 14.7% 29.0% 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 31 0 27.1 1-4 0 0 16 443 299 144 119 31 22 5 0 4 35 6 0 0
RP MLB Percentile 50 0 31 24-9 0 0 95 28 31 75 31 48 43 47 40 38 51 89 76 66
RP MLB AVG 29 2 37.0 2-2 0 2 5 619 395 224 159 34 22 6 1 5 36 15 2 1
Career 111 0 116.2 9-10 0 5 36 1,753 1,178 575 480 105 79 14 1 11 118 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 29.4% 5.0% .279 .432 .748 .327 .375 .408 .216 .268 .282 .348 87.1 91.2 7.8 2.95
RP MLB Percentile 91 93 18 29 34 36 4 4 67 85 42 49 62 29 80 85
RP MLB AVG 22.4% 9.9% .241 .392 .717 .316 .289 .320 .237 .318 .281 .361 87.7 89.3 13.2 4.29
Career 24.6% 5.2% .234 .344 .620 .272 .292 .315 .219 .268 .267 .329 87.9 90.9 9.7 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 BOS26.6% (96.6)10.6% (97.1)42.2% (93.5)-16.9% (86.0)3.6% (84.6)--- 37.2% 62.8%
RP MLB Percentile 23 (79) 17 (89) 92 (95) - 44 (89) 8 (89) - - - 17.1% 82.3%
RP MLB AVG 38.2% (94.5) 26.0% (93.9) 20.6% (89.4) 25.5% (85.3) 21.4% (82.5) 16.7% (79.6) 17.3% (86.2) 18.5% (86.4) 32.3% (68.3) 48.3% 51.5%
Career30.5% (96.5)2.7% (97.1)37.9% (92.4)-18.9% (84.7)9.9% (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% (13)29.8% (6)34.8% (17)-29.3% (16)43.8% (4)--- 22.4% 33.8%
RP MLB Percentile 8 (59) 63 (42) 88 (21) - 56 (31) 94 (52) - - - 6.3% 90.6%
RP MLB AVG 27.1% (22) 27.2% (9) 26.9% (11) 29.0% (18) 27.9% (15) 27.4% (10) 21.6% (14) 23.7% (16) 22.0% (8) 27.9% 28.7%
Career26.0% (74)29.8% (6)31.9% (76)-28.7% (71)27.6% (30)--- 26.3% 30.3%

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 46.2% 21.8% 28.2% 3.8% 41.0% 38.5% 33.3% 28.2% 20.3% 64.1% 23.1% 7.7% 5.1% 35.9%
RP MLB Percentile 60 37 69 7 15 44 30 72 73 46 48 19 69 43
RP MLB AVG 43.7% 21.7% 24.4% 10.2% 34.7% 40.9% 34.0% 25.1% 18.0% 62.8% 24.4% 5.8% 7.1% 36.9%
Career 47.3% 21.3% 23.1% 8.4% 34.1% 40.4% 37.1% 22.5% 19.1% 62.9% 24.6% 7.8% 4.8% 37.0%

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 .279 .327 .375 .408 .216 .268 .282 .348 87.1 91.2 7.8 18.2% 35.9% 23.5%
RP MLB Percentile 18 36 4 4 67 85 42 49 62 29 80 38 43 49
RP MLB AVG .241 .316 .289 .320 .237 .318 .281 .361 87.7 89.3 13.2 18.1% 36.9% 24.6%
Career .234 .272 .292 .315 .219 .268 .267 .329 87.9 90.9 9.7 14.3% 37.0% 25.8%

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 50.3% 67.5% 50.6% 33.2% 25.0% 20.3% 75.0% 84.8% 54.8% 16.9% 12.6% 29.6% 17.6% 60.5% 0.59 54.9%
RP MLB Percentile 96 87 77 56 50 73 50 52 76 62 64 70 56 72 78 77
RP MLB AVG 44.5% 63.6% 47.3% 31.5% 25.6% 18.0% 74.4% 83.8% 58.6% 16.3% 12.1% 28.5% 17.1% 58.2% 0.50 50.9%
Career 48.4% 67.2% 52.9% 35.2% 27.7% 19.1% 72.3% 83.6% 50.6% 14.3% 14.7% 29.0% 19.1% 61.2% 0.54 53.1%

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% 26.9% 31.4% 41.8% 37.0% 19.6% 43.3% 31.2% 37.5% 8.8%
RP MLB Percentile 96 9 5 69 52 83 64 53 15 97
RP MLB AVG 44.5% 34.7% 26.9% 38.4% 36.3% 22.9% 40.8% 29.9% 43.2% 6.6%
Career 48.4% 23.5% 32.5% 44.0% 33.1% 19.6% 47.3% 30.5% 37.0% 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 60.0% 9.0% 30.9% 17.7% 64.7% 52.9% 22.9% 29.2% 25.5%
RP MLB Percentile 77 89 58 85 68 61 70 66 95
RP MLB AVG 58.6% 12.3% 29.7% 14.5% 60.7% 50.0% 21.1% 26.5% 19.2%
Career 60.9% 10.6% 28.9% 17.3% 63.0% 48.6% 18.3% 27.9% 23.3%

Justin Slaten PLV

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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 443 5.02 45.4% 20.1% 34.5% 10.8% 5.9% 2.4 +3 3.13
RP MLB Percentile 28 68 46 82 74 74 32 36 27 72
RP MLB AVG 619 4.93 45.8% 17.3% 36.8% 9.0% 4.7% 0.7 0 3.50
Career 1,753 5.12 47.3% 19.1% 33.6% 13.7% 4.9% -2.6 +16 2.70
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