Justin Slaten P Boston Red Sox
+0.3 WAR
INJURED · Injured 15-Day (D15)
Age 28 RHP 6'4" / 222 lbs MLB Svc 2.0 · Ctrl thru 2029 peak 0.4 · 2027
ERA3.68
FIP3.85
xFIP3.18
SIERA3.00
K%22.6%
BB%6.5%
K-BB%16.0%
IP35
trajectory · 10 yrs
0.4peak
2027
K†6060
FB Velo
p8196.7
Whiff%
p6727.9%
K%
p2318.2%
xwOBA vs
p710.292
FB+0.8 (25%)
CT (52%)
CU (1%)
SL (21%)

Career (MLE) + Projections

Park-neutral MLB-equivalent. MiLB translated via MLE factors. FIP-based WAR vs replacement FIP=5.3 (SP) / 4.95 (RP, <80 IP). FIP+ = runs above league-avg FIP · REP = replacement-level bonus.

YearAge LvlTeam GGSIPBF KBBHR K%BB%HR% ERAFIP WAR
201921ROKAZL Rangers10131000.00
202123A+Hickory Crawdads201982366110311723.1%9.7%6.7%6.016.08-0.9
202224AAFrisco RoughRiders265522466648621.3%21.7%3.3%6.795.84-0.5
202325AAARound Rock Express4016023586201030.3%8.7%5.5%2.874.65+0.2
202426MLBBoston Red Sox450562275910425.9%4.0%1.9%3.072.46+1.6
202527MLBBoston Red Sox39037149309318.2%5.8%2.1%3.893.47+0.6
▸ 2026 Season
202628MLBBoston Red Sox403145200.00
ROS28MLBBOS141459154224.7%6.5%2.6%3.593.66+0.2
2026 Total28MLBBOS1773206226.8%8.0%2.1%2.902.95+0.4
▸ 2027+ Projections — Marcel base + age-bracket aging
202729MLBBOS34341433410424.1%6.9%2.7%3.753.80+0.4
202830MLBBOS33331383310423.5%7.1%2.8%3.883.93+0.4
202931MLBBOS32321343110422.9%7.4%2.9%4.004.06+0.3
203032MLBBOS30301282910422.3%7.6%3.0%4.114.18+0.3
203133MLBBOS29291222710421.7%7.8%3.0%4.234.31+0.2
▸ Career (all levels · actual + projected)
Career1752529112403001295324.2%10.4%4.3%4.584.72+1.9
/ 200 IP12017200853206893624.2%10.4%4.3%4.584.72+1.3

Career Path Comps

What happened to similar pitchers from this age · Y-axis: ERA+ (100 = league avg, 150 = elite, 80 = below) · Bands: P10–P90 outer, P25–P75 inner · Gold: OGILVIE projection

Profile at Match Age Next 3 Yrs Career
CompAgeRole FIPK%BB%HR/BFBABIP FIPK%K-BB%IP ΔFIPLow FIPIPMatch
Justin Slaten (OGILVIE) 3.66 24.7%6.5%2.6% 3.93 23.5%16.4%98 +0.27
Chris Hatcher R 2028 · 2.93 FIP 30 SU 2.93 27.1%6.6%2.3%.292 4.62 22.6%14.0%137 +1.69 2.93 176 83
Ryan Brasier R 2026 · 3.68 FIP 28 SW 3.68 25.0%7.7%3.1%.289 3.07 24.2%17.9%130 -0.61 2.31 403 77
Jumbo Diaz R 2029 · 3.21 FIP 31 SW 3.21 25.2%6.0%2.7%.286 3.66 21.9%12.2%152 +0.45 2.80 284 77
Daniel Hudson R 2026 · 3.48 FIP 28 SW 3.48 24.5%7.9%2.6%.302 3.74 22.8%13.6%168 +0.26 1.69 468 77
Matt Ramsey R 2026 · 3.76 FIP 28 SU 3.76 24.9%8.8%3.0%.276 2.42 21.7%12.6%34 -1.34 2.42 125 76
Simon Castro R 2026 · 3.07 FIP 28 SW 3.07 22.7%5.6%2.1%.313 3.78 28.3%18.0%75 +0.71 3.07 185 76
Matt Bush R 2028 · 2.88 FIP 30 SW 2.88 24.7%6.0%2.0%.232 3.96 22.2%12.7%75 +1.08 2.88 249 75
Kelvin Herrera R 2026 · 3.88 FIP 28 SU 3.88 20.7%5.4%3.3%.285 3.90 22.6%15.4%51 +0.02 2.35 297 75
Cody Mincey R 2027 · 2.48 FIP 29 SU 2.48 21.8%6.0%0.9%.239 5.59 13.9%5.5%114 +3.11 2.48 147 74
Anthony Swarzak R 2027 · 2.83 FIP 29 SU 2.83 21.3%4.9%1.7%.386 3.47 26.1%19.8%181 +0.64 2.35 260 74
Ryan Pressly R 2026 · 3.77 FIP 28 SW 3.77 24.2%5.6%3.7%.251 2.32 34.0%27.5%146 -1.45 1.82 586 74
C.C. Lee R 2026 · 2.58 FIP 28 SW 2.58 23.9%7.0%1.1%.323 3.07 30.9%21.5%63 +0.49 2.58 121 74
Jonathan Broxton R 2029 · 3.73 FIP 31 SW 3.73 24.5%8.2%3.0%.325 3.80 21.7%13.5%76 +0.07 3.65 137 73
Junichi Tazawa R 2027 · 2.99 FIP 29 SW 2.99 22.7%4.9%2.2%.345 4.56 20.6%12.8%147 +1.57 2.99 227 73
Liam Hendriks R 2026 · 3.09 FIP 28 SW 3.09 28.6%8.4%2.4%.303 1.71 35.2%30.1%160 -1.38 0.60 495 73
Jason Stoffel R 2025 · 3.51 FIP 27 SW 3.51 27.2%8.0%3.1%.293 3.51 103 72
Drew Storen R 2026 · 3.77 FIP 28 SW 3.77 21.1%5.3%3.2%.304 3.89 19.5%11.6%65 +0.12 2.26 172 72
Scott Oberg R 2026 · 2.59 FIP 28 SW 2.59 24.4%5.0%1.7%.278 3.17 26.0%16.6%56 +0.58 2.59 302 72
Bryan Shaw R 2026 · 3.54 FIP 28 SW 3.54 25.1%9.1%2.6%.277 3.88 21.1%12.7%203 +0.34 2.86 596 72
Brandon Morrow R 2029 · 3.51 FIP 31 SU 3.51 18.3%5.6%2.3%.280 3.50 21.2%14.8%153 -0.01 2.67 186 72

Contract

ESTIMATED  ·  service-time + WAR-based estimator (needs verification)
Status   Pre-Arb
MLB Debut   2024
Service   2.000 yrs.days
Team Control Through   2029
First FA Year   2030
YearStatusSalary Proj WAR Value Surplus
2026Pre-Arb$0.8M+0.3$1M+$0.4M
2027Arb-1$1M+0.4$2M+$0.6M
2028Arb-2$2M+0.4$2M+$0.0M (cut)
2029Arb-3$3M+0.3$1M+$0.0M (cut)
Totals $5M $6M +$1M