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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 23.1 5.40 1.50 30.8% 5.8%
186th 2
Sv
250th 33.0
IP
272nd 4.33
ERA
272nd 1.36
WHIP
25th 22.3%
K%
37th 10.0%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 12.6% 29.9% 52.8% 4.9% 5.05 3.13
69th 94.4
FB MPH
140th 12.1%
SwStr%
104th 28.4%
CSW%
123rd 50.8%
Str-ICR
213th 4.7%
MTK%
95th 4.94
PLV
114th 3.58
PLA
Holds List
Rank
22nd
Saves+Holds List
Rank
43rd

Articles

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

7/8/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 7/7Rick Graham

6/29/2026Fantasy Baseball Relief Pitcher Roundup: 6/28Rick 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 27 0 23.1 1-4 0 13 5.40 1.50 3.21 3.36 3.12 3.13 30.8% 5.8% 11.2 1.54 .417 21.1% 61.2% 39.4% 45.5% 12.6% 29.9% 0.58 5.05
RP MLB Percentile 47 0 28 27-7 0 91 22 22 76 74 90 66 93 89 7 21 1 33 13 24 55 59 69 79 71
RP MLB AVG 26 1 33.0 2-2 2 4 4.33 1.36 4.32 4.34 4.38 3.58 22.3% 10.0% 8.4 1.15 .291 18.2% 72.4% 37.2% 43.5% 12.1% 28.4% 0.50 4.94
Career 107 0 112.2 9-10 5 33 3.83 1.14 3.02 3.09 3.41 2.69 24.7% 5.4% 8.2 0.88 .297 14.9% 63.7% 37.8% 47.2% 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 27 0 23.1 1-4 0 0 13 388 257 131 104 29 20 5 0 4 32 6 0 0
RP MLB Percentile 47 0 28 27-7 0 0 91 28 31 75 30 43 41 42 38 33 49 87 75 64
RP MLB AVG 26 1 33.0 2-2 0 2 4 567 361 206 146 31 21 6 1 4 32 14 2 1
Career 107 0 112.2 9-10 0 5 33 1,698 1,136 562 465 103 77 14 1 11 115 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 30.8% 5.8% .302 .479 .822 .357 .417 .453 .223 .280 .297 .370 86.9 91.1 8.5 3.21
RP MLB Percentile 93 89 7 14 14 15 1 1 57 76 25 35 61 31 77 76
RP MLB AVG 22.3% 10.0% .243 .394 .721 .318 .291 .322 .238 .320 .282 .362 87.8 89.4 13.3 4.32
Career 24.7% 5.4% .238 .351 .632 .277 .297 .321 .221 .271 .270 .333 87.9 90.8 9.9 3.02

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 BOS26.3% (96.6)10.1% (97.2)43.6% (93.4)-17.3% (86.1)2.8% (84.6)--- 36.3% 63.7%
RP MLB Percentile 23 (80) 15 (90) 94 (95) - 45 (89) 5 (88) - - - 15.4% 84.0%
RP MLB AVG 38.1% (94.4) 25.8% (94.0) 20.7% (89.4) 25.6% (85.3) 21.5% (82.5) 16.5% (79.8) 17.2% (86.3) 18.5% (86.4) 32.7% (68.2) 48.3% 51.5%
Career30.6% (96.5)2.3% (97.2)38.1% (92.3)-19.0% (84.6)10.0% (84.6)--- 32.9% 67.1%

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 BOS20.6% (13)23.1% (3)36.1% (16)-28.4% (14)54.5% (3)--- 21.3% 34.8%
RP MLB Percentile 10 (55) 25 (59) 90 (20) - 52 (31) 99 (56) - - - 3.7% 94.3%
RP MLB AVG 27.0% (20) 26.9% (8) 27.1% (10) 29.1% (16) 28.1% (13) 27.3% (9) 21.6% (13) 23.7% (15) 23.9% (7) 27.7% 28.7%
Career26.4% (74)23.1% (3)32.1% (75)-28.5% (69)27.8% (29)--- 26.2% 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 45.5% 22.7% 28.8% 3.0% 40.9% 39.4% 31.8% 28.8% 19.3% 60.6% 25.8% 7.6% 6.1% 39.4%
RP MLB Percentile 55 47 84 5 13 46 21 80 67 27 31 24 57 24
RP MLB AVG 43.5% 21.8% 24.4% 10.3% 34.7% 41.0% 33.9% 25.1% 18.0% 62.5% 24.4% 5.9% 7.2% 37.2%
Career 47.2% 21.4% 23.0% 8.4% 33.9% 40.7% 37.0% 22.4% 18.8% 62.2% 25.2% 7.8% 5.0% 37.8%

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 .302 .357 .417 .453 .223 .280 .297 .370 86.9 91.1 8.5 21.1% 39.4% 25.0%
RP MLB Percentile 7 15 1 1 57 76 25 35 61 31 77 33 24 37
RP MLB AVG .243 .318 .291 .322 .238 .320 .282 .362 87.8 89.4 13.3 18.2% 37.2% 24.7%
Career .238 .277 .297 .321 .221 .271 .270 .333 87.9 90.8 9.9 14.9% 37.8% 26.2%

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 49.7% 66.2% 49.0% 31.8% 25.8% 19.3% 74.2% 84.4% 53.2% 17.3% 12.6% 29.9% 17.0% 58.8% 0.58 52.8%
RP MLB Percentile 95 81 63 49 52 67 52 55 70 71 59 69 47 53 79 63
RP MLB AVG 44.5% 63.5% 47.2% 31.4% 25.6% 18.0% 74.4% 84.0% 58.4% 16.3% 12.1% 28.4% 17.1% 58.1% 0.50 50.8%
Career 48.2% 66.9% 52.6% 34.9% 28.0% 18.8% 72.0% 83.4% 50.2% 14.3% 14.7% 29.0% 19.0% 60.8% 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 49.7% 27.6% 32.2% 40.2% 38.7% 19.3% 42.0% 29.4% 38.4% 8.5%
RP MLB Percentile 95 15 6 57 66 85 54 45 17 93
RP MLB AVG 44.5% 34.7% 27.0% 38.4% 36.5% 22.9% 40.5% 29.9% 43.1% 6.6%
Career 48.2% 23.6% 32.7% 43.7% 33.4% 19.6% 47.1% 30.1% 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 59.8% 10.1% 30.2% 18.1% 62.5% 51.0% 23.3% 29.1% 27.4%
RP MLB Percentile 68 77 53 90 54 54 77 67 96
RP MLB AVG 58.5% 12.3% 29.7% 14.5% 60.8% 49.9% 21.0% 26.4% 19.2%
Career 60.8% 10.9% 28.6% 17.4% 62.5% 48.1% 18.2% 27.8% 23.7%

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 388 5.05 46.1% 19.3% 34.5% 11.6% 4.9% 5.4 +5 3.13
RP MLB Percentile 28 71 51 78 72 72 37 16 13 66
RP MLB AVG 567 4.94 45.9% 17.3% 36.8% 9.0% 4.7% 0.9 +0 3.58
Career 1,698 5.12 47.6% 18.8% 33.6% 14.0% 4.7% 0.4 +19 2.69
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