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MLBPlayer profile/BOS
RP#63BOSAdvanced data
Justin Slaten
Relief pitcher
6' 4" · 222 lbs · 28 yo
Form Line · next game · as of Jun 23
1.2K▲ +0.1vs pace (1.1)
typical range (~68%) 0–2 · on 17 games
ER0.8+0.2
The One's forward projection vs the player's own season pace — not a grade, not accuracy-tested. What is Form Line?
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Colorado Rockies
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Statcast · 2026 season
The advanced layer
Expected stats, sabermetric context, and rate metrics straight from the MLB Stats API. Each bar is calibrated against league benchmark ranges, not season percentiles — so the position is stable even on a small sample.
PITCHING
Run prevention
17 G · 0 GS · 14.2 IP
Run prevention
ERA6.14
5.502.50
FIP5.08
5.003.00
xFIP3.16
5.003.00
WHIP1.57
1.551.00
Stuff & control
K/911.7
6.012.0
BB/93.1
4.52.0
HR/92.45
1.600.70
K%28.8%
18.0%30.0%
BB%7.6%
11.0%5.0%
Quality of contact
BABIP—
.270.330
GO/AO0.85
0.801.60
Pitch mix
Arsenal
2026 · 242 pitches
PitchUseWhiffRV/100
- Cutter48%22%-1.2
- 4-Seam Fastball31%24%-2.5
- Sweeper15%50%-1.1
RV/100 is pitcher-side — negative is a pitch that saved runs.