Players · D · Pitcher · 2021

Jon Duplantier

Arizona Diamondbacks National League West

Age: 27
B/T: L/R
Height: 6' 4"
Weight: 229 lb

Born: July 11, 1994 in Newark, DE, United States
MLB debut: April 1, 2019

dbWAR: .0
IP: 13.0
ERA: 13.15
FIP: 8.63
K/9: 8.3
FIP−: 202

Jon Duplantier was a starting pitcher for the Arizona Diamondbacks. In 2021 he struck out 12 batters over 13.0 innings across 4 appearances, 4 of them starts, going 0-3. His ERA of 13.15 was 208.3% higher than the league average of 4.27. Stripping out defence, his 8.63 FIP suggests he pitched better than his ERA shows. He missed bats on 20.8% of swings (9.3% of every pitch he threw), walked 11.4% of the batters he faced and struck out 17.1%. His -0.5 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.

FIP8.63

K/98.3

WHIP2.08

WAR-.5

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2021	AZ	4	4	13.0	0	3	0	19	19	12	8	13.15	8.63	2.08	8.3	5.5	308	202	-0.5
2019	AZ	15	3	36.2	1	1	1	39	18	34	18	4.42	3.95	1.55	8.3	4.4	98	88	0.5

Batting

Standard and advanced, by season.

																					Trend
2021	AZ	2	3	0	0	0	0	0	2	.000	.333	.000	.000	—	0.0%	66.7%	.251	-0.2	53	0.0
2019	AZ	7	8	1	0	0	0	0	5	.125	.125	.125	.000	.333	0.0%	62.5%	.109	-1.5	-45	-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	33	28	8	2	5	6	.286	.394	.536	.401	18.2%
vs RHB	37	31	11	3	3	6	.355	.444	.710	.483	16.2%

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 Jon Duplantier throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

Four-seamSinkerSliderKnuckle curveChangeup

Select a count to see exactly what Jon Duplantier throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	36.7%	99	91.2	2,209	45.5%	29.3%	18	.333	1.145
Sinker	24.8%	67	91.0	2,095	46.3%	16.7%	12	—	—
Slider	16.3%	44	84.3	2,195	47.7%	20.0%	14	—	—
Knuckle Curve	13.3%	36	78.9	2,401	33.3%	14.3%	10	—	—
Changeup	8.9%	24	83.8	1,643	33.3%	10.0%	5	—	—

Jon Duplantier'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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Jon Duplantier

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.