Players · H · Pitcher · 2021

JD Hammer

Philadelphia Phillies National League East

Age: 27
B/T: R/R
Height: 6' 3"
Weight: 202 lb

Born: July 12, 1994 in Fort Collins, CO, United States
MLB debut: May 26, 2019

dbWAR: -.0
IP: 20.0
ERA: 4.95
FIP: 4.87
K/9: 9.9
FIP−: 114

JD Hammer was a relief pitcher for the Philadelphia Phillies. In 2021 he struck out 22 batters over 20.0 innings across 20 appearances, going 1-1. His ERA of 4.95 was 16.0% higher than the league average of 4.27 — 10th of 19 on his team, and 398th of 567 among MLB pitchers with 20+ innings. Stripping out defence, his 4.87 FIP suggests the ERA was no fluke. He missed bats on 24.4% of swings (10.1% of every pitch he threw), walked 11.7% of the batters he faced and struck out 23.4%. His -0.0 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.

League context

Percentile among qualified pitchers, 2021.

FIP4.87

K/99.9

WHIP1.60

WAR-.0

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2021	PHI	20	0	20.0	1	1	0	21	11	22	11	4.95	4.87	1.60	9.9	5.0	116	114	-0.0
2019	PHI	20	0	19.0	1	0	0	15	8	13	12	3.79	5.11	1.42	6.2	5.7	84	113	-0.0

Batting

Standard and advanced, by season.

																					Trend
2021	PHI	1	1	0	0	0	0	0	1	.000	.000	.000	.000	—	0.0%	100.0%	.000	-0.3	-121	-0.0
2019	PHI	1	1	0	0	0	0	0	0	.000	.000	.000	.000	.000	0.0%	0.0%	.000	-0.3	-117	-0.0

Platoon splits

How left- and right-handed hitters fare against him.

Season

Opponent batting by the side the hitter bats from, 2021. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	47	41	10	1	5	12	.244	.340	.341	.302	25.5%
vs RHB	47	40	11	2	6	10	.275	.383	.475	.377	21.3%

Hot and cold zones

Batting average by pitch location, 2021.

Below averageLeague averageAbove average

Batting average by location of the pitch that ended each plate appearance, catcher's view. The bordered square is the strike zone; the outer band is chase territory. Cells with fewer than 8 at-bats are left grey rather than shown as signal. League average on the same attribution is .243.

Pitch sequencing

What JD Hammer throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

Four-seamSliderCurveballSinker

Select a count to see exactly what JD Hammer throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.

Season


Four-Seam Fastball	59.3%	240	94.0	2,298	50.4%	20.6%	46	.283	.922
Slider	37.3%	151	82.9	2,591	38.4%	30.4%	33	.212	.520

JD Hammer's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

Head to head

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JD Hammer

Similar players

Nearest 2021 seasons by command, run prevention and role, on rate statistics rather than totals.

Luke FarrellMIN

ERA: 4.74
FIP: 4.83
SO: 25
WAR: -0.0

Very close

Austin VothWSH

ERA: 5.34
FIP: 4.90
SO: 59
WAR: -0.1

Very close

Andrew MillerSTL

ERA: 4.75
FIP: 4.50
SO: 40
WAR: 0.1

Very close

Daniel BardCOL

ERA: 5.21
FIP: 4.28
SO: 80
WAR: 0.5

Very close

How these are computed

wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.