Players · J · Pitcher · 2019

Williams Jerez

Pittsburgh Pirates National League Central

Age: 27
B/T: L/L
Height: 6' 4"
Weight: 210 lb

Born: May 16, 1992 in Santiago, Dominican Republic
MLB debut: August 7, 2018

dbWAR: -.3
IP: 10.1
ERA: 4.35
FIP: 6.60
K/9: 7.8
FIP−: 147

Williams Jerez was a relief pitcher for the Pittsburgh Pirates. In 2019 he struck out 9 batters over 10.1 innings across 12 appearances, going 1-0. His ERA of 4.35 was 3.3% lower than the league average of 4.51. Stripping out defence, his 6.60 FIP suggests that his ERA had some help behind him. He missed bats on 19.5% of swings (8.9% of every pitch he threw), walked 18.8% of the batters he faced and struck out 18.8%. His -0.2 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, 2019.

FIP6.60

K/97.8

WHIP2.03

WAR-.2

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2019	PIT/SF	12	0	10.1	1	0	0	12	5	9	9	4.35	6.60	2.03	7.8	7.8	97	147	-0.2
2018	LAA	17	0	15.0	0	0	0	17	10	15	8	6.00	5.36	1.67	9.0	4.8	145	129	-0.1

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2019. 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	19	16	6	1	3	1	.375	.474	.625	.463	5.3%
vs RHB	29	23	6	1	6	8	.261	.414	.522	.400	27.6%

Pitch sequencing

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

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Four-seamSliderChangeup

Select a count to see exactly what Williams Jerez throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	55.5%	106	94.1	2,119	42.5%	9.4%	21	.476	1.369
Slider	32.5%	62	87.1	2,064	40.3%	30.4%	13	—	—
Changeup	12.0%	23	86.3	1,065	43.5%	45.5%	5	—	—

Williams Jerez'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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Williams Jerez

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.