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MLBPlayer profile/COL
RP#54COLAdvanced data
Seth Halvorsen
Relief pitcher
6' 2" · 243 lbs · 26 yo
Form Line · next game · as of Jun 24
0.8K▼ -0.1vs pace (0.9)
typical range (~68%) 0–2 · on 18 games
ER0.4+0.1
The One's forward projection vs the player's own season pace — not a grade, not accuracy-tested. What is Form Line?
Final · vs BOS
Boston Red Sox
BOS @ COL
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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
18 G · 0 GS · 16.1 IP
Run prevention
ERA3.31
5.502.50
FIP5.31
5.003.00
xFIP5.00
5.003.00
WHIP1.78
1.551.00
Stuff & control
K/98.8
6.012.0
BB/97.7
4.52.0
HR/91.10
1.600.70
K%20.3%
18.0%30.0%
BB%17.7%
11.0%5.0%
Quality of contact
BABIP—
.270.330
GO/AO0.89
0.801.60
Pitch mix
Arsenal
2026 · 298 pitches
PitchUseWhiffRV/100
- 4-Seam Fastball61%15%-1.8
- Slider31%42%+1.4
RV/100 is pitcher-side — negative is a pitch that saved runs.