Players · G · Pitcher · 2026 regular season

Zac Gallen

Arizona Diamondbacks National League West

Age: 31
B/T: R/R
Height: 6' 2"
Weight: 189 lb
Number: #23

Born: August 3, 1995 in Somerdale, NJ, United States
MLB debut: June 20, 2019
Drafted: 2016, round 3
College: North Carolina
Salary, 2026: $16.2M

Compare with…vs Kyle Freeland vs Jose Quintana vs Michael Lorenzen

dbWAR: 18.8
IP: 105.1
ERA: 6.07
FIP: 5.34
K/9: 5.5
FIP−: 128

Zac Gallen is a starting pitcher for the Arizona Diamondbacks. In 2026 he struck out 64 batters over 105.1 innings across 22 appearances, 20 of them starts, going 3-9. His ERA of 6.07 was 45.1% higher than the league average of 4.18 — the second worst on his team, and 489th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 5.34 FIP suggests he pitched better than his ERA shows. He missed bats on 19.0% of swings (8.8% of every pitch he threw), walked 7.4% of the batters he faced and struck out 13.6%. 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, 2026 regular season.

FIP5.34

K/95.5

WHIP1.55

WAR-.2

WAR by season

Pitching Regular season

Standard and advanced, by season. Regular-season games only — postseason games are listed separately below.


2026	AZ	22	20	105.1	3	9	128	71	64	35	6.07	5.34	1.55	5.5	3.0	145	128	-0.2
2025	AZ	33	33	192.0	13	15	176	103	175	66	4.83	4.50	1.26	8.2	3.1	116	108	1.6
2024	AZ	28	28	148.0	14	6	133	60	156	54	3.65	3.38	1.26	9.5	3.3	89	83	3.1
2023	AZ	34	34	210.0	17	9	188	81	220	47	3.47	3.26	1.12	9.4	2.0	80	75	5.0
2022	AZ	31	31	184.0	12	4	121	52	192	47	2.54	3.05	0.91	9.4	2.3	64	77	4.2
2021	AZ	23	23	121.1	4	10	108	58	139	49	4.30	4.25	1.29	10.3	3.6	101	100	1.6
2020	AZ	12	12	72.0	3	2	55	22	82	25	2.75	3.66	1.11	10.3	3.1	62	82	1.6
2019	AZ/MIA	15	15	80.0	3	6	62	25	96	36	2.81	3.61	1.23	10.8	4.0	62	80	1.7

Batting Regular season

Standard and advanced, by season. Regular-season games only — postseason games are listed separately below.

																					Trend
2021	AZ	21	42	6	0	3	0	1	18	.188	.212	.250	.063	.429	2.4%	42.9%	.204	-4.0	21	0.2
2019	AZ/MIA	14	24	2	0	1	0	0	8	.105	.105	.105	.000	.182	0.0%	33.3%	.092	-4.7	-57	-0.1

Separate from the regular season

Postseason Postseason

Wild Card through World Series. These games are counted on their own: none of them are in the regular-season tables, career totals, league context, leaderboards or dbWAR on this page.

Postseason pitching

Postseason Zac Gallen's postseason pitching, by October and round. Not part of any regular-season figure on this page.
Season	Team	Round	G	GS	IP	W	L	H	ER	HR	BB	SO	ERA	WHIP	K/9
2023 Post	AZ	Postseason total	6	6	33.2	2	3	31	17	6	14	24	4.54	1.34	6.4
		Wild Card	1	1	6.0	1	0	5	2	0	3	4	3.00	1.33	6.0
		NLDS	1	1	5.1	1	0	5	2	1	2	4	3.38	1.31	6.8
		NLCS	2	2	11.0	0	2	14	9	5	4	5	7.36	1.64	4.1
		World Series	2	2	11.1	0	1	7	4	0	5	11	3.18	1.06	8.7

Box-score and rate statistics only. wOBA, wRC+, FIP and dbWAR are measured against a full league season, and a postseason is a few teams playing each other for a month, so they are not computed for October.

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2026. 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	252	227	70	9	18	27	.308	.365	.498	.376	10.7%
vs RHB	220	202	58	10	17	37	.287	.342	.500	.364	16.8%

Pitch sequencing

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

ShowBatter

Four-seamSliderKnuckle curveChangeupSinkerUnknown

Select a count to see exactly what Zac Gallen throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	35.0%	626	93.4	2,310	44.7%	6.4%	152	.322	.894
Slider	22.9%	410	88.9	2,351	40.0%	28.6%	107	.290	.871
Knuckle Curve	19.0%	340	81.6	2,430	43.2%	23.4%	75	.360	.994
Changeup	17.0%	304	86.6	1,541	38.8%	26.8%	71	.141	.388
Sinker	5.5%	99	92.7	2,176	49.5%	7.8%	21	.476	1.427

Zac Gallen'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.

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Similar players

Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.

Brady SingerCIN

ERA: 5.85
FIP: 5.62
SO: 126
WAR: -0.8

Luis CastilloSEA

ERA: 5.85
FIP: 5.05
SO: 112
WAR: 0.0

Mike BurrowsHOU

ERA: 5.99
FIP: 5.64
SO: 75
WAR: -0.5

Chris PaddackMIA

ERA: 6.79
FIP: 4.86
SO: 40
WAR: 0.1

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.