Players · J · Pitcher · 2023

Zach Jackson

Age: 29
B/T: R/R
Height: 6' 4"
Weight: 230 lb

Born: December 25, 1994 in Tulsa, OK, United States
MLB debut: April 9, 2022

dbWAR: 1.3
IP: 18.0
ERA: 2.50
FIP: 3.09
K/9: 11.5
FIP−: 71

Zach Jackson was a relief pitcher for the Oakland Athletics. In 2023 he struck out 23 batters over 18.0 innings across 19 appearances, going 2-1. His ERA of 2.50 was 42.3% lower than the league average of 4.33. Stripping out defence, his 3.09 FIP suggests that his ERA had some help behind him. He missed bats on 27.7% of swings (11.8% of every pitch he threw), walked 12.5% of the batters he faced and struck out 28.7%. His 0.4 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, 2023.

FIP3.09

K/911.5

WHIP1.56

WAR.4

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2023	OAK	19	0	18.0	2	1	1	18	5	23	10	2.50	3.09	1.56	11.5	5.0	58	71	0.4
2022	OAK	54	0	48.0	2	3	3	28	16	67	33	3.00	2.78	1.27	12.6	6.2	76	70	1.0

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2023. 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	37	33	6	0	3	12	.182	.250	.182	.206	32.4%
vs RHB	43	36	12	1	7	11	.333	.442	.472	.405	25.6%

Pitch sequencing

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

ShowBatter

Four-seamSlider

Select a count to see exactly what Zach Jackson throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	58.9%	219	93.1	2,128	46.1%	24.2%	40	.250	.577
Slider	40.3%	150	83.9	2,421	45.3%	33.9%	29	.276	.830

Zach Jackson'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

Put Zach Jackson beside up to three others.

Compare — add up to 3 more players

Zach Jackson

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.