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Justin Slaten BOS RP R 

Born: 09/15/1997 Age: 27

FanGraphs Player Page

2025 OPL OPL Player Page

Signed By

COPPER KINGS 🌵 for $1

On MLB 40-man: YES
Acquired: Trade (NYM) Dec'23

Sun 3/30 Mon 3/31 Tue 4/01
@TEX 2:35 PM EDT @BAL 3:05 PM EDT ---

Positions
RP
2026 Earned Positions
RP

All Leagues
Average $2.73 Median $3.00
FanGraphs Points
Average $2.71 Median $3.00

Roster%
96.63%
Change
7Day 6.45%
30Day 59.21%

2025 OPL 2025 OPL Round 1
OPL Roster%
8.33%
OPL Average Salary
$2.60


March 28, 2025 11:26 AM : Slaten struck out one and didn't allow a baserunner in a scoreless ninth inning to earn the save Thursday against the Rangers.
Analysis: Closer Aroldis Chapman entered for the eighth inning with the game tied 2-2, as the lefty-hitting Corey Seager was batting leadoff, opening up the ninth inning for Slaten after Boston took the lead. The right-hander recorded two saves and 13 holds with a 2.93 ERA, 1.01 WHIP and 58:9 K:BB across 55.1 innings as a rookie last season, and he's one of the Red Sox's top relief arms again in 2025, even if Chapman is expected to be the primary closer early on.

MLB Stats

Pitching

YearTeamGGSIP SV HLD K H BB HBP HR P/IP Pts
2024BOS44055.12135847924 6.92 383.07
2025BOS101.01010000 14.4 14.40

MILB Stats

Pitching

YearTeamGGSIP SV HLD K H BB HBP HR P/IP Pts
2019TEX (R)101.00010000 9.4 9.40
2019TEX (A-)101015.1002121702 3.6 55.27
2021TEX (A+)201982.1001109331417 3.32 273.37
2022TEX (CPX)101.00020000 11.4 11.40
2022TEX (AA)25550.20364494806 3.35 169.73
2023TEX (AA)35151.12876411609 6.01 308.57
2023TEX (AAA)508.101103401 6.43 53.57
2024BOS (AA)100.10111100 8.61 2.87

Recent Games

Last 10 MLB Games

DateTeamOpponentGSWinSaveHoldIPTBF RERHKBBHBPHR Pts
Mar 27, 2025 BOS @TEX 0 0 1 0 1.0 3 0 0 0 1 0 0 0 14.40
Sep 29, 2024 BOS TBR 0 0 1 0 1.0 4 0 0 1 0 0 0 0 9.80
Sep 24, 2024 BOS @TOR 0 0 0 0 1.0 5 0 0 1 1 0 0 0 6.80
Sep 19, 2024 BOS @TBR 0 0 0 0 1.0 4 1 0 1 2 0 0 0 8.80
Sep 18, 2024 BOS @TBR 0 1 0 0 1.0 5 0 0 2 2 0 0 0 6.20
Sep 13, 2024 BOS @NYY 0 0 0 1 1.0 5 0 0 2 2 0 0 0 10.20
Sep 12, 2024 BOS @NYY 0 0 0 0 1.0 4 0 0 1 1 0 0 0 6.80
Sep 11, 2024 BOS BAL 0 0 0 0 1.0 4 1 1 1 0 0 0 1 -7.50
Sep 8, 2024 BOS CHW 0 0 0 0 1.0 3 0 0 0 1 0 0 0 9.40
Sep 7, 2024 BOS CHW 0 0 0 1 1.0 3 0 0 0 2 0 0 0 15.40
Totals 0 1 2 2 10.0 40 2 1 9 12 0 0 1 80.30

Last 10 MILB Games

DateLevelTeamOpponentGSWinSave IPTBFRERHKBBHBPHR
Aug 23, 2024 AA POR SOM 0 0 0 0.1 3 1 1 1 1 1 0 0
Sep 24, 2023 AAA RR @TAC 0 0 0 2.0 8 1 1 1 2 1 0 1
Sep 22, 2023 AAA RR @TAC 0 0 0 0.2 5 0 0 1 2 2 0 0
Sep 20, 2023 AAA RR @TAC 0 0 0 1.2 6 0 0 0 1 1 0 0
Sep 17, 2023 AAA RR LV 0 1 0 2.0 7 0 0 1 2 0 0 0
Sep 13, 2023 AAA RR LV 0 0 0 2.0 6 0 0 0 3 0 0 0
Sep 8, 2023 AA FRI NWA 0 0 0 2.0 7 0 0 0 4 1 0 0
Sep 4, 2023 AA FRI NWA 0 0 0 2.0 8 1 1 3 3 0 0 0
Aug 30, 2023 AA FRI CC 0 0 0 2.0 7 0 0 0 5 1 0 0
Aug 25, 2023 AA FRI @MID 0 1 0 2.0 7 0 0 0 1 2 0 0
Totals 0 2 0 16.2 64 3 3 7 24 9 0 1

Avg Salary & Roster%

Last 30 days

Mar 3Mar 6Mar 9Mar 12Mar 15Mar 18Mar 21Mar 24Mar 27Mar 30$2.50$4.00100.0%0.0%
Avg $ - All FormatsAvg $ - FanGraphs PointsRoster%

2026 Position Eligibility Progress

To gain eligibility, a player must have 5 GS or 10 G at a position in the majors, or 20 G at a position in the minors.
P020
GS - MajorsG - MajorsG - Minors

Transaction History

Date Transaction Type Team Salary
April 26, 2024 5:02 PM add Hearty Bradishes $2
July 15, 2024 12:02 PM cut Hearty Bradishes $1
March 9, 2025 1:14 PM add COPPER KINGS 🌵 $1

Recent Trades for Justin Slaten in FanGraphs Points

Date Proposing Team Proposing Team Gives Accepting Team Accepting Team Gives
March 25, 2025 4:17 PM Hot Pizza 🍕 Victor Scott II STL OF L $1 
 88 mph 💨 Justin Slaten BOS RP R $2 
March 15, 2025 8:28 PM 🐡 Salmón de Campusano 🐡 Justin Slaten BOS RP R $1 
Kumar Rocker TEX SP/RP R $3 
Colt Emerson SEA ST SS L $1
 AKA Big Papi Clay Holmes NYM SP/RP R $7 
Nick Yorke PIT AAA 2B/OF R $5
$8 loan
March 13, 2025 12:19 PM Paper Falls Everywhere 🗽 Tyler Soderstrom ATH C/1B L $2 
Colson Montgomery CHW AAA SS L $1
Kumar Rocker TEX SP/RP R $3 
 Troicinet MacKenzie Gore WSN SP L $8 
Justin Slaten BOS RP R $1 
$4 loan
February 27, 2025 6:37 PM The Pendletones Trevor Story BOS SS R $3 
Justin Slaten BOS RP R $5 
 Mallard Power 🦆🚂 Evan Phillips LAD RP R $3 15IL 
Zack Gelof ATH 2B R $5 10IL 
January 4, 2025 10:43 AM Contreras Tour (Naylor's Version) Zac Gallen ARI SP R $33 
Justin Slaten BOS RP R $5 
 🚀Hoo Lee WAR Plans GC👊🏼🇺🇸🔥 Randy Arozarena SEA OF R $21
Jac Caglianone KCR ST 1B L $5
December 11, 2024 1:50 PM The 🐂 Jose Berrios TOR SP R $10 
 Diamond Dogs 2025!! Gabriel Moreno ARI C R $5 
Justin Slaten BOS RP R $9 
July 2, 2024 2:10 PM 🐈‍⬛ Kansas City Katz 🐈 Tyler Glasnow LAD SP R $18 
Ke'Bryan Hayes PIT 3B R $9 
Rhys Hoskins MIL 1B R $8
MJ Melendez KCR OF L $5
Trevor Larnach MIN OF L $1 
Justin Slaten BOS RP R $2 
 Kneel before Zod Craig Kimbrel BAL RP R $5
Salvador Perez KCR C/1B R $4
Willi Castro MIN 2B/SS/3B/OF S $1 
Michael King SDP SP R $5 
Jarred Kelenic ATL OF L $8 
Andrew Vaughn CHW 1B R $2
$17 loan
May 10, 2024 2:58 PM GrubHub Prairie Fire Colson Montgomery CHW AAA SS L $5
Zach Neto LAA SS R $3 10IL 
 Texas Wranglers Relaxed Fit Justin Slaten BOS RP R $4 
May 3, 2024 7:55 PM Otto Seventeen Ben Brown CHC SP/RP R $1 
Casey Mize DET SP R $1
Samuel Basallo BAL ST C/1B L $2
Jackson Jobe DET SP/RP R $1
 Sheboygan Chairmakers Willy Adames MIL SS R $15
Zach Eflin TBR SP R $10 
Gabriel Moreno ARI C R $6 
Justin Slaten BOS RP R $3 
$29 loan
April 13, 2024 4:15 PM Southbay Orlando Arcia ATL SS R $2 
Nestor Cortes NYY SP L $5 
Kutter Crawford BOS SP R $15 15IL 
Brandon Lowe TBR 1B/2B L $9 
Justin Slaten BOS RP R $4 
Andrew Vaughn CHW 1B R $10
 Fairhaven Bulldogs Nick Castellanos PHI OF R $21
Michael Kopech CHW RP R $1 15IL 
Eloy Jimenez TBR ST Util R $21 
Bobby Miller LAD AAA SP R $4 
$2 loan