Zac Gallen

Active

Arizona Diamondbacks · Pitcher

Age 306' 2" · 189 lbsThrows Right

FBaseball Overview

At 30 years old, Gallen enters 2026 as a proven innings-eater and strikeout source for Arizona, though his early-season numbers raise significant concerns after a down 2025 campaign. His All-MLB and All-Star credentials from 2023 remain relevant, but the sharp decline in ERA (4.83 to 6.15) and jump in WHIP (1.26 to 1.58) through his first handful of starts suggest he's lost command and effectiveness—red flags that could persist if mechanical or health issues aren't resolved. Strikeout production remains his calling card with 52 Ks already, but wins and ERA categories appear highly risky at current performance levels. Fantasy managers should approach Gallen cautiously, waiting for evidence of adjustment before investing heavily, or pivot to more consistent rotation options.

News Updates

Zac Gallen takes loss in lackluster outing
Arizona Diamondbacks starter Zac Gallen allowed six runs on seven hits while striking out four over 5.2 innings in a loss to San Francisco. The poor performance continued a rough stretch for Gallen this season with his record falling to 3-8. Fantasy players should evaluate his consistency going forward.
Jul 2, 2026

MLB Pitching

Year	Team	G	GS	W	L	ERA	WHIP	K	IP	BB
2019	2 teams▼	15	15	3	6	2.81	1.23	96	80.0	36
2020	Arizona Diamondbacks	12	12	3	2	2.75	1.11	82	72.0	25
2021	Arizona Diamondbacks	23	23	4	10	4.30	1.29	139	121.1	49
2022	Arizona Diamondbacks	31	31	12	4	2.54	0.91	192	184.0	47
2023	Arizona Diamondbacks	34	34	17	9	3.47	1.12	220	210.0	47
2024	Arizona Diamondbacks	28	28	14	6	3.65	1.26	156	148.0	54
2025	Arizona Diamondbacks	33	33	13	15	4.83	1.26	175	192.0	66
2026	Arizona Diamondbacks	18	18	3	8	6.36	1.57	56	92.0	28
Career	Totals	194	194	69	60	3.82	1.19	1116	1099.1	352

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Minor League Pitching

Year	Team	G	GS	W	L	SV	ERA	WHIP	K	IP	BB
2016	GCL Cardinals	6	3	0	0	1	1.86	0.72	15	9.2	0
2017	2 teams▼	13	13	4	5	0	3.79	1.33	42	71.1	19
2018	New Orleans Baby Cakes	25	25	8	9	0	3.65	1.47	136	133.1	48
2019	New Orleans Baby Cakes	14	14	9	1	0	1.77	0.71	112	91.1	17
Career	Totals	58	55	23	13	1	2.67	1.11	342	310.2	81

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Game Log2026 season

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Pitching Analytics2026 season · via Baseball Savant

Click for year to year changes

FB Velo93.4 mph

Avg Spin2209 rpm

Whiff %18.9%

K %13.5%

BB %6.8%

Hard Hit %44.4%

Barrel %10.5%

xERA6.28

xBA Against0.309

xSLG Against0.522

BA Against0.307

SLG Against0.511

GB%45.1%

FB%27.9%

What These Stats Mean

FB Velo — Average fastball velocity. Harder throwers generate more swings and misses, setting up every other pitch in their arsenal. Velocity is the foundation of strikeout upside.

Avg Spin — Average spin rate across all pitches. Higher spin creates more movement and makes pitches harder to square up — elite spinners run better strikeout and batting average against numbers.

Whiff % — Swings-and-misses per swing. The most direct measure of a pitcher's ability to miss bats and the best leading indicator of strikeout rate.

K % — Strikeout rate per batter faced. The core fantasy pitching stat — high K% means reliable strikeout totals that hold up even in shorter starts.

BB % — Walk rate per batter faced. The primary control metric. High BB% tanks ERA and WHIP and keeps baserunners on constantly. Elite starters typically run below 7%.

Hard Hit % — Percentage of batted balls hit 95 mph or harder against. Low hard-hit% means weak contact, protecting both ERA and the defense behind the pitcher.

Barrel % — Percentage of batted balls barreled against. The most direct home run predictor — low barrel% pitchers rarely give up long balls.

xERA — Expected ERA based on contact quality allowed, removing the effect of sequencing, luck, and defense. Better predictor of future ERA than ERA itself.

xBA Against — Expected batting average opponents should hit based on contact quality. A gap between xBA and actual BA indicates unsustainable luck in either direction.

xSLG Against — Expected slugging allowed based on contact quality. High xSLG against predicts future extra-base damage; low xSLG means the pitcher is genuinely suppressing power.

BA Against — Actual batting average opponents are hitting — a key WHIP component. Check xBA to see if the number is sustainable.

SLG Against — Actual slugging allowed. Captures hits, doubles, triples, and home runs — lower means the pitcher is limiting the power damage he gives up.

GB% — Ground ball rate. High GB% pitchers generate double plays, limit home runs, and keep the ball in the park — great for protecting ERA and WHIP ratios.

FB% — Fly ball rate. High FB% pitchers give up more air contact — dangerous when combined with high exit velocity, less so when contact is soft.

Loading player data...

Year

Team

ERA

WHIP

2019

2 teams▼

2.81

1.23

80.0

2020

Arizona Diamondbacks

2.75

1.11

72.0

2021

Arizona Diamondbacks

4.30

1.29

139

121.1

2022

Arizona Diamondbacks

2.54

0.91

192

184.0

2023

Arizona Diamondbacks

3.47

1.12

220

210.0

2024

Arizona Diamondbacks

3.65

1.26

156

148.0

2025

Arizona Diamondbacks

4.83

1.26

175

192.0

2026

Arizona Diamondbacks

6.36

1.57

92.0

Career

Totals

194

3.82

1.19

1116

1099.1

352

Year

Team

ERA

WHIP

2016

GCL Cardinals

1.86

0.72

9.2

2017

2 teams▼

3.79

1.33

71.1

2018

New Orleans Baby Cakes

3.65

1.47

136

133.1

2019

New Orleans Baby Cakes

1.77

0.71

112

91.1

Career

Totals

2.67

1.11

342

310.2