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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 8.2 4.15 1.27 32.4% 8.1%
139th 1
Sv
290th 19.0
IP
195th 4.51
ERA
150th 1.42
WHIP
25th 22.2%
K%
106th 10.6%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 12.0% 28.0% 54.0% 7.3% 5.12 2.98
64th 94.3
FB MPH
163rd 11.9%
SwStr%
189th 28.5%
CSW%
68th 50.5%
Str-ICR
332nd 4.5%
MTK%
55th 4.93
PLV
90th 3.63
PLA
Holds List
Rank
27th
Saves+Holds List
Rank
50th

Articles

5/27/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/27Rick Graham

5/26/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 5/26Rick Graham

5/26/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/26Rick Graham

5/25/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/25Rick Graham

5/24/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/24Rick 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 10 0 8.2 0-2 0 5 4.15 1.27 2.91 4.41 3.17 2.98 32.4% 8.1% 8.3 2.08 .300 28.6% 73.2% 40.9% 45.5% 12.0% 28.0% 0.59 5.12
RP MLB Percentile 28 0 17 0-11 0 77 45 56 79 39 87 74 93 69 45 12 41 15 54 31 48 53 46 77 83
RP MLB AVG 15 1 19.0 1-1 1 3 4.51 1.42 4.36 4.37 4.34 3.63 22.2% 10.6% 8.5 1.09 .292 17.4% 72.1% 37.0% 44.4% 11.9% 28.5% 0.49 4.93
Career 90 0 98.0 8-8 5 25 3.49 1.06 2.97 3.14 3.46 2.61 23.9% 5.5% 7.5 0.83 .270 14.5% 65.3% 37.6% 47.5% 15.0% 28.7% 0.53 5.14

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 10 0 8.2 0-2 0 0 5 150 99 51 37 8 6 0 0 2 12 3 0 0
RP MLB Percentile 28 0 17 0-11 0 0 77 16 18 85 15 80 73 90 24 31 29 86 57 47
RP MLB AVG 15 1 19.0 1-1 0 1 3 330 209 122 85 18 12 3 0 2 19 9 1 1
Career 90 0 98.0 8-8 0 5 25 1,460 978 482 398 82 63 9 1 9 95 22 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 32.4% 8.1% .235 .412 .709 .316 .300 .364 .193 .272 .249 .361 88.3 93.0 2.5 2.91
RP MLB Percentile 93 69 53 40 50 51 41 27 84 79 76 48 48 21 95 79
RP MLB AVG 22.2% 10.6% .241 .388 .719 .322 .292 .321 .236 .323 .283 .364 88.0 89.3 13.0 4.36
Career 23.9% 5.5% .221 .323 .589 .263 .270 .294 .218 .272 .262 .330 88.2 91.0 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 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 30.0% (96.6) - 51.3% (92.7) - 16.0% (86.0) 2.7% (86.1) - - - 30.0% 70.0%
RP MLB Percentile 36 (81) - 95 (93) - 37 (89) 5 (94) - - - 8.7% 91.0%
RP MLB AVG 36.7% (94.3) 26.3% (93.9) 21.3% (89.2) 26.2% (85.5) 22.7% (82.4) 17.7% (80.0) 18.3% (86.1) 20.6% (86.4) 31.8% (68.1) 47.9% 52.0%
Career 31.6% (96.5) - 38.0% (92.0) - 19.2% (-) 11.1% (84.7) - - - 31.6% 68.3%

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 20.0% (5) - 29.9% (6) - 33.3% (7) 50.0% (0) - - - 20.0% 31.4%
RP MLB Percentile 14 (61) - 63 (40) - 72 (44) 96 (0) - - - 5.6% 70.8%
RP MLB AVG 26.6% (11) 27.6% (5) 26.8% (6) 29.8% (10) 27.7% (9) 27.2% (6) 22.1% (8) 25.2% (11) 23.3% (6) 28.0% 28.6%
Career 27.1% (66) - 30.6% (65) - 28.9% (62) 26.5% (26) - - - 27.1% 29.5%

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% 31.8% 0.0% 36.4% 54.5% 31.8% 13.6% 23.3% 59.1% 27.3% 9.1% 4.5% 40.9%
RP MLB Percentile 48 39 86 0 39 93 41 5 96 32 30 18 74 31
RP MLB AVG 44.4% 21.3% 24.1% 10.2% 34.1% 41.5% 33.7% 24.8% 17.6% 62.7% 24.1% 6.0% 7.2% 37.0%
Career 47.5% 21.2% 22.3% 9.0% 32.4% 42.1% 37.8% 20.1% 19.2% 62.3% 25.2% 7.9% 4.7% 37.6%

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 .235 .316 .300 .364 .193 .272 .249 .361 88.3 93.0 2.5 28.6% 40.9% 24.3%
RP MLB Percentile 53 51 41 27 84 79 76 48 48 21 95 15 31 51
RP MLB AVG .241 .322 .292 .321 .236 .323 .283 .364 88.0 89.3 13.0 17.4% 37.0% 24.4%
Career .221 .263 .270 .294 .218 .272 .262 .330 88.2 91.0 9.7 14.5% 37.6% 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 55.3% 66.0% 50.0% 25.4% 24.0% 23.3% 76.0% 82.8% 52.9% 16.0% 12.0% 28.0% 14.7% 60.7% 0.59 54.0%
RP MLB Percentile 98 80 80 17 42 96 42 61 71 42 53 46 17 79 77 80
RP MLB AVG 44.3% 63.0% 46.5% 30.8% 25.6% 17.6% 74.4% 83.9% 58.5% 16.6% 11.9% 28.5% 16.9% 57.7% 0.49 50.5%
Career 48.6% 67.0% 53.3% 34.9% 28.1% 19.2% 71.9% 83.1% 49.6% 13.7% 15.0% 28.7% 19.1% 61.4% 0.53 52.6%

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 55.3% 22.0% 35.3% 42.7% 40.7% 18.7% 40.7% 28.7% 36.0% 8.7%
RP MLB Percentile 98 3 2 74 70 85 52 39 12 91
RP MLB AVG 44.3% 34.9% 26.9% 38.2% 36.3% 22.8% 40.9% 30.5% 42.6% 6.5%
Career 48.6% 22.3% 33.1% 44.6% 32.7% 19.5% 47.8% 30.1% 36.8% 6.8%

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 56.0% 14.7% 29.3% 14.3% 67.6% 59.5% 20.2% 20.5% 27.3%
RP MLB Percentile 20 24 51 46 90 94 41 15 92
RP MLB AVG 58.5% 12.8% 29.3% 14.2% 60.0% 49.5% 21.2% 26.4% 19.4%
Career 60.6% 11.5% 28.3% 16.9% 63.0% 48.4% 17.1% 26.6% 23.0%

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 150 5.12 52.0% 16.0% 32.0% 20.0% 7.3% 0.9 -2 2.98
RP MLB Percentile 16 83 92 37 87 87 6 48 71 74
RP MLB AVG 330 4.93 46.2% 16.8% 36.9% 9.3% 4.5% 0.4 +0 3.63
Career 1,460 5.14 48.4% 18.4% 33.2% 15.3% 4.9% -4.1 +11 2.61
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