Justin
Slaten
PAge : 29Throws : R
#63
Justin Slaten
#63P
Boston Red Sox
Height : 6' 4" · Weight : 101 kg · Bats : R · Throws : R · MLB debut : 2024-03-30
Born in : Longview, TX, USA
MLB record
| Year | Team | PJ | V | D | MPM | MJ | RB | WHIP |
|---|---|---|---|---|---|---|---|---|
| 2026 | Boston Red Sox | 36 | 2 | 4 | 4.60 | 31.1 | 39 | 1.37 |
| 2025 | Boston Red Sox | 36 | 2 | 4 | 4.24 | 34.0 | 25 | 1.09 |
| 2024 | Boston Red Sox | 44 | 6 | 2 | 2.93 | 55.1 | 58 | 1.01 |
| Career totals | 116 | 10 | 10 | 3.73 | 120.2 | 122 | 1.13 | |
ContractBoston Red Sox payroll →
- Type
- Pre-Arbitration
- Length
- 1 yr · 2026–2026
- Total value
- 0.8 M$
- AAV
- 0.79 M$
2026
0.79 M$
Pre-arb
2027
—
Arb 1
2028
—
Arb 2
2029
—
Arb 3
Advanced stats, 2026Relief pitcherMLB stats →
ERA
4.60
FIP
3.04
xFIP
2.82
ERA-
108
WHIP
1.37
K%
28.5 %
BB%
5.8 %
Strikeouts
39
Innings
31.3
Wins
2
Stats: MLB (statsapi) and Baseball Savant.
2027 projectionMLB trends →
Projected WAR
0.6
Strikeouts
41
2026 WAR
0.6
This season's pace, over the average of the last two workloads, adjusted for next year's age.
Trend
→ Stable (+3)
- 20241.5 WAR · 1.8 per full season
- 20250.4 WAR · 0.8 per full season
- 20260.6 WAR · 1.2 per full season
Outlook, age included
+13 · 28 y.o. · prime years
It is only a projection. It knows nothing about injuries, trades or role changes.
Player ratings, 2026All ratings →
Ratings from 0 to 100, computed from Statcast and MLB stats over four seasons, never by hand. 75 = established regular, 87 = 90th percentile, 95+ = elite.
OV · Overall
91
Star
- VEL
- Velocity
- 81
- STF
- Stuff
- 83
- CTL
- Control
- 90
- CNT
- Contact allowed
- 86
- STA
- Stamina
- —
- DUR
- Durability
- 70
- EX
- Experience
- 47
Why these ratings?Hide details
- VEL — Velocity : Fastball velocity
- STF — Stuff : Strikeouts, K − BB
- CTL — Control : Walks avoided
- CNT — Contact allowed : xwOBA, barrels and hard-hit balls allowed
- STA — Stamina : Innings per start and innings pitched
- DUR — Durability : Games played over several seasons
- EX — Experience : Seasons in the majors
WAR and PAL Rating, 2026How we rate →
WAR is fWAR (FanGraphs' version, distributed through MLB's API): wins added above a replacement player. PAL Rating scores performance from 0 to 100 against regulars in the same role (50 = median).
WAR
0.6
#81 of 263 regular relievers
PAL Rating
88 / 100
#31 of 263 regular relievers
Value Rating
62 / 100
Surplus $5.1M · salary $0.8MPAL: dimensions
A pitcher's WAR
Computed by MLB from FIP (strikeouts, walks, home runs). FIP: 3.04 · RA9-WAR: -0.3
StatcastStatcast leaderboards →
MLB's tracking of every ball, 2026 season. The percentile ranks the player among regulars in the role: 90th means better than 90% of them.
Fastball
96.6 mi/h
74th percentile
K%
28.5 %
84th percentile
BB%
5.8 %
91th percentile
xERA
2.94
87th percentile
xwOBA allowed
.266
87th percentile
Barrels allowed
4.4 %
85th percentile
| Season | Team | WAR | PAL | OV | Fastball | K% | BB% | xERA | xwOBA allowed |
|---|---|---|---|---|---|---|---|---|---|
| 2026 | BOS | 0.6 | 88 | 91 | 96.6 | 28.5 | 5.8 | 2.94 | .266 |
| 2025 | BOS | 0.4 | 51 | 85 | 96.7 | 18.2 | 7.3 | 3.51 | .292 |
| 2024 | BOS | 1.5 | 89 | 90 | 96.4 | 25.9 | 4.0 | 3.25 | .284 |
Game log, 2026
| Date | Opponent | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Aug 12 | @ TOR | 1.0 | 0 | 0 | 1 | 1 | 4.60 |
| Aug 8 | vs ATH | 0.2 | 1 | 1 | 1 | 0 | 4.75 |
| Aug 6 | vs CWS | 1.0 | 3 | 1 | 0 | 2 | 4.55 |
| Aug 2 | @ LAD | 0.1 | 0 | 0 | 0 | 0 | 4.40 |
| Aug 1 | @ LAD | 1.0 | 0 | 0 | 0 | 1 | 4.45 |
| Jul 29 | @ ATH | 1.0 | 1 | 0 | 0 | 1 | 4.61 |
| Jul 27 | @ ATH | 0.2 | 0 | 0 | 0 | 0 | 4.78 |
| Jul 26 | vs TOR | 1.0 | 0 | 0 | 0 | 1 | 4.91 |
| Jul 22 | vs BAL | 1.1 | 1 | 0 | 0 | 1 | 5.11 |
| Jul 17 | vs TB | 1.0 | 0 | 0 | 0 | 1 | 5.40 |