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MLBPlayer profile/BOS
RP#44BOSAdvanced data
Aroldis Chapman
Relief pitcher
6' 4" · 235 lbs · 38 yo
Form Line · next game · as of Jul 31
1.3K▲ +0vs pace (1.3)
typical range (~68%) 0–2 · on 38 games
ER0.1-0.1
The One's forward projection vs the player's own season pace — not a grade, not accuracy-tested. What is Form Line?
Today · @ LAD
Los Angeles Dodgers
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Statcast fingerprint
Aroldis Chapman
MLB percentile · n=406
- xwOBA91
- xBA96
- xSLG93
- Barrel %25
- Hard-hit %50
- Exit velo61
- Whiff %80
- Chase %81
- K %95
- BB %19
Elite expected average (96th pct) — walks (19th pct) the soft spot.
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.
HITTING
Plate output
38 G · 0 PA · 0 AB
Slash & power
AVG.000
.210.320
OBP.000
.280.400
SLG.000
.360.550
OPS.000
.650.950
HR0
540
ISO.000
.120.280
Plate discipline
BB%—
5.0%14.0%
K%—
30.0%14.0%
BABIP—
.270.330
Expected & sabermetric
xwOBA—
.290.380
wOBA—
.290.380
wRC+—
80130
WAR0.0
0.04.0
PITCHING
Run prevention
38 G · 0 GS · 36.2 IP
Run prevention
ERA1.72
5.502.50
FIP2.26
5.003.00
xFIP3.23
5.003.00
WHIP1.23
1.551.00
Stuff & control
K/912.0
6.012.0
BB/94.2
4.52.0
HR/90.25
1.600.70
K%31.6%
18.0%30.0%
BB%11.0%
11.0%5.0%
Quality of contact
BABIP—
.270.330
GO/AO1.00
0.801.60
Pitch mix
Arsenal
2026 · 596 pitches
PitchUseWhiffRV/100
- 4-Seam Fastball37%19%-1.5
- Sinker35%30%+1.7
- Slider18%44%+0.9
- Split-Finger10%41%+3.3
RV/100 is pitcher-side — negative is a pitch that saved runs.
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