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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 19.0 6.16 1.63 28.7% 5.7%
176th 2
Sv
259th 29.0
IP
285th 4.41
ERA
268th 1.40
WHIP
62nd 22.2%
K%
39th 10.2%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.6 13.0% 30.0% 50.5% 4.6% 5.01 3.33
65th 94.5
FB MPH
123rd 12.1%
SwStr%
117th 28.4%
CSW%
180th 50.6%
Str-ICR
197th 4.6%
MTK%
129th 4.93
PLV
151st 3.55
PLA
Holds List
Rank
22nd
Saves+Holds List
Rank
47th

Articles

6/29/2026Fantasy Baseball Relief Pitcher Roundup: 6/28Rick Graham

6/28/2026Fantasy Baseball Relief Pitcher Roundup: 6/27Rick Graham

6/25/2026Fantasy Baseball Relief Pitcher Roundup: 6/24Rick Graham

6/24/2026Fantasy Baseball Relief Pitcher Roundup: 6/23Rick Graham

6/23/2026Fantasy Reliever Rankings: Closers, Holds & SOLDs - 6/23Rick 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 22 0 19.0 1-4 0 9 6.16 1.63 3.47 4.00 3.54 3.33 28.7% 5.7% 12.3 1.89 .431 22.2% 59.1% 42.1% 45.6% 13.0% 30.0% 0.55 5.01
RP MLB Percentile 41 0 25 32-5 0 85 19 24 66 46 78 56 82 88 7 12 4 25 12 19 56 64 66 66 62
RP MLB AVG 23 1 29.0 2-2 2 4 4.41 1.40 4.35 4.37 4.42 3.55 22.2% 10.2% 8.5 1.13 .291 18.0% 72.0% 37.2% 43.4% 12.1% 28.4% 0.49 4.93
Career 102 0 108.1 9-10 5 29 3.90 1.14 3.06 3.19 3.49 2.71 24.1% 5.4% 8.3 0.91 .296 15.1% 63.3% 38.2% 47.3% 14.9% 29.0% 0.53 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 22 0 19.0 1-4 0 0 9 323 211 112 87 26 18 4 0 4 25 5 0 0
RP MLB Percentile 41 0 25 32-5 0 0 85 25 28 76 27 48 42 61 34 27 40 88 70 61
RP MLB AVG 23 1 29.0 2-2 0 2 4 494 314 180 127 27 18 5 0 4 28 12 2 1
Career 102 0 108.1 9-10 0 5 29 1,633 1,090 543 448 100 75 13 1 11 108 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 28.7% 5.7% .325 .525 .890 .386 .431 .473 .228 .292 .288 .375 87.0 91.7 8.2 3.47
RP MLB Percentile 82 88 7 13 13 14 4 3 51 66 39 36 69 30 79 66
RP MLB AVG 22.2% 10.2% .243 .393 .721 .319 .291 .321 .237 .320 .280 .361 87.8 89.3 13.4 4.35
Career 24.1% 5.4% .240 .355 .638 .280 .296 .321 .222 .273 .267 .333 88.0 90.9 9.9 3.06

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 28.2% (96.6) 7.7% (97.3) 45.5% (93.3) - 16.4% (86.2) 2.2% (84.9) - - - 35.9% 64.1%
RP MLB Percentile 28 (81) 13 (90) 95 (96) - 45 (90) 3 (89) - - - 15.9% 83.8%
RP MLB AVG 37.5% (94.5) 25.1% (94.0) 21.0% (89.4) 26.0% (85.1) 21.1% (82.6) 17.4% (79.6) 17.8% (86.2) 19.1% (86.4) 31.8% (68.1) 48.0% 51.8%
Career 31.1% (96.5) 1.5% (97.3) 38.3% (92.2) - 18.9% (-) 10.1% (84.6) - - - 32.6% 67.3%

Justin Slaten Pitch › Results

Hide 2026 MLB Percentile | Hide 2026 MLB Average
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 18.7% (11) 28.0% (3) 36.7% (15) - 30.2% (13) 42.9% (0) - - - 20.7% 35.3%
RP MLB Percentile 8 (54) 51 (56) 88 (20) - 59 (31) 92 (80) - - - 6.8% 87.5%
RP MLB AVG 26.9% (17) 27.3% (7) 27.4% (9) 29.6% (15) 28.3% (12) 27.7% (8) 21.6% (12) 24.1% (14) 23.3% (6) 27.6% 28.7%
Career 26.2% (72) 28.0% (3) 32.2% (74) - 28.8% (68) 26.7% (26) - - - 26.3% 30.4%

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 45.6% 19.3% 31.6% 3.5% 38.6% 40.4% 29.8% 29.8% 17.6% 57.9% 26.3% 8.8% 7.0% 42.1%
RP MLB Percentile 56 62 87 5 26 44 32 76 48 21 28 29 45 19
RP MLB AVG 43.4% 21.6% 24.5% 10.5% 34.5% 41.1% 33.7% 25.2% 17.9% 62.5% 24.5% 5.9% 7.2% 37.2%
Career 47.3% 20.8% 23.3% 8.6% 33.2% 40.9% 36.7% 22.4% 18.5% 61.7% 25.2% 8.0% 5.1% 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 .325 .386 .431 .473 .228 .292 .288 .375 87.0 91.7 8.2 22.2% 42.1% 27.6%
RP MLB Percentile 7 14 4 3 51 66 39 36 69 30 79 25 19 26
RP MLB AVG .243 .319 .291 .321 .237 .320 .280 .361 87.8 89.3 13.4 18.0% 37.2% 24.7%
Career .240 .280 .296 .321 .222 .273 .267 .333 88.0 90.9 9.9 15.1% 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 49.2% 65.3% 48.3% 30.5% 26.9% 17.6% 73.1% 82.1% 54.0% 17.0% 13.0% 30.0% 17.6% 57.3% 0.55 50.5%
RP MLB Percentile 95 69 62 30 57 48 57 67 73 59 64 66 61 40 66 48
RP MLB AVG 44.4% 63.4% 47.0% 31.3% 25.6% 17.9% 74.4% 83.9% 58.6% 16.3% 12.1% 28.4% 17.1% 57.9% 0.49 50.6%
Career 48.1% 66.7% 52.6% 34.8% 28.3% 18.5% 71.7% 83.0% 50.2% 14.1% 14.9% 29.0% 19.2% 60.6% 0.53 52.1%

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 49.2% 24.8% 34.1% 41.2% 40.2% 19.2% 40.6% 27.6% 38.4% 8.7%
RP MLB Percentile 95 7 2 69 71 89 50 29 17 92
RP MLB AVG 44.4% 34.5% 27.0% 38.5% 36.5% 22.8% 40.7% 29.9% 43.1% 6.5%
Career 48.1% 22.9% 33.1% 44.1% 33.5% 19.5% 47.0% 29.7% 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 60.1% 10.2% 29.7% 19.1% 60.9% 49.4% 23.2% 26.0% 26.0%
RP MLB Percentile 75 84 54 93 53 55 75 27 88
RP MLB AVG 58.5% 12.4% 29.6% 14.4% 60.6% 49.8% 21.0% 26.4% 19.1%
Career 60.9% 11.0% 28.5% 17.6% 62.2% 47.7% 18.0% 27.1% 23.2%

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 323 5.01 45.2% 20.4% 34.4% 10.8% 4.6% 6.4 +6 3.33
RP MLB Percentile 25 62 34 94 76 76 43 21 16 56
RP MLB AVG 494 4.93 45.8% 17.2% 37.0% 8.9% 4.6% 0.9 +0 3.55
Career 1,633 5.12 47.5% 19.0% 33.5% 14.0% 4.6% 1.4 +20 2.71
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