Zac Gallen

30-Year-Old PitcherSP

Arizona Diamondbacks

2025 Stats

W-L

13-15

ERA

4.83

WHIP

1.26

175

2026 Projections

W-L

ERA

WHIP

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2026 Fantasy Outlook

Gallen won double-digit games for a fourth consecutive season, winning 13 of his 33 starts. That is, however, where the good news ends. Gallen took a loss in 15 of the other 18 starts thanks to a career-worst 4.83 ERA fueled by a career-worst home run rate. Gallen surrendered 31 homers on the season, nearly as many as he had over the previous two seasons combined, with 20 of those homers coming off his two primary pitches. Gallen's four-seamer outcomes peaked in 2022, but 2025 was the first time he has allowed so many home runs off the pitch, and that gopheritis led to his issue of stranding runners with his LOB coming in 10 percentage points below his career average. Gallen worked on expanding his repertoire in 2025 by bring back more cutters and sinkers than he threw in 2024, but neither pitch was effective. Perhaps the path forward for a rebound for Gallen would be for him to simplify his offerings, focus on what he does best and throw away his 2025 struggles as he enters his quantity years, as his quality years appear to be a thing of the past. The fact he re-signed with Arizona isn't particularly surprising, so Gallen will have familiar surroundings in 2026. Read Past Outlooks

RANKS

From Preseason

Overall Rank

Dynasty

#228

ADP

League Majors

Bats R

Throws R

40 Man Yes

Height 6'2"

Weight 198

DOB 8/3/1995

Born Somerdale, NJ

College North Carolina

Drafted 3rd Rd 2016 STL

Works scoreless inning

PArizona Diamondbacks

February 26, 2026

Gallen allowed one hit and struck out two over one scoreless inning in Wednesday's spring start against the Dodgers.

Analysis
Gallen made his Cactus League debut, throwing 23 pitches (14 strikes) against a lineup of backups. He allowed a single to the first batter faced then retired the next three. Gallen, a late free-agent signing, is slightly behind other starters but should be ready in time for the regular season. With news that Merrill Kelly (back) will not start Opening Day, Gallen is an option to make a fourth consecutive Opening Day start for the Diamondbacks. His first spring outing last year was a one-inning affair on Feb. 24, and Gallen was ready to take the ball on Opening Day in 2025.

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Pitching Stats

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2025

2024

2023

2022

2021

2020

2019

2025 MLB Game Log

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2024 MLB Game Log

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2023 MLB Game Log

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2022 MLB Game Log

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2021 MLB Game Log

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2020 MLB Game Log

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2019 MLB Game Log

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Minor League Game Log

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Pitching Appearances Breakdown

Average Pitch Count

Last 10 Games

Last 5 Games

100

How many pitches does Zac Gallen generally throw?

1-10

11-20

21-30

31-40

41-50

51-60

61-70

71-80

81-90

91-100

101-110

111-120

121+

1-10

11-20

21-30

31-40

41-50

51-60

61-70

71-80

81-90

91-100

101-110

111-120

121+

1-10

11-20

21-30

31-40

41-50

51-60

61-70

71-80

81-90

91-100

101-110

111-120

121+

What part of the game does Zac Gallen generally pitch?

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

Extra

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

Extra

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

Extra

% Games Reaching Innings Threshold

% Games By Number of Innings Pitched

Left/Right Pitching Splits

Since 2023

-3%

BAA vs RHP

2025

-13%

BAA vs RHP

2024

-12%

BAA vs LHP

2023

-5%

BAA vs RHP

	BAA	Batters	K	BB	H	2B	3B	HR
Since 2023vs Left	.242	1114	259	85	246	49	8	33
Since 2023vs Right	.234	1166	292	82	251	59	4	33
2025vs Left	.256	400	76	34	92	22	1	12
2025vs Right	.223	413	99	32	84	15	3	19
2024vs Left	.222	303	77	25	61	12	5	7
2024vs Right	.252	318	79	29	72	17	0	6
2023vs Left	.244	411	106	26	93	15	2	14
2023vs Right	.232	435	114	21	95	27	1	8
More Splits→	View More Split Stats

Home/Away Pitching Splits

Since 2023

-24%

ERA at Home

2025

-11%

ERA at Home

2024

-16%

ERA at Home

2023

-44%

ERA at Home

	ERA	WHIP	IP	W	L	SV	K/9	BB/9	HR/9
Since 2023Home	3.46	1.15	283.2	26	13	0	9.6	2.5	0.9
Since 2023Away	4.56	1.27	266.1	18	17	0	8.3	3.0	1.3
2025Home	4.56	1.25	98.2	6	7	0	8.6	3.3	1.4
2025Away	5.11	1.28	93.1	7	8	0	7.8	2.9	1.5
2024Home	3.36	1.19	83.0	8	3	0	9.8	2.7	0.5
2024Away	4.02	1.35	65.0	6	3	0	9.1	4.0	1.1
2023Home	2.47	1.03	102.0	12	3	0	10.6	1.6	0.6
2023Away	4.42	1.20	108.0	5	6	0	8.3	2.4	1.3
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Stat Review

How does Zac Gallen compare to other starting pitchers?

This section compares his stats with all starting pitcher seasons from the previous three seasons (minimum 120 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 120 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.

K/BB

2.65

K/9

8.2

BB/9

3.1

HR/9

1.5

Fastball

93.6 mph

ERA

4.83

WHIP

1.26

BABIP

.284

GB/FB

1.31

Left On Base

67.0%

Exit Velocity

83.7 mph

Barrels/BBE

6.5%

Spin Rate

2209 rpm

Balls Hit 95+ MPH

27.8%

Swinging Strike

9.8%

Prospect Rankings History

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Defensive Stats

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Stats Vs Today's Lineup

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Past Fantasy Outlooks

2025

2024

2023

2022

2021

2020

Gallen turned in another solid but not ace-level season. His career 26.6 percent strikeout rate is very good, but not elite. Last year, it was a career low of 25.1 percent. After two years of declining walk rates, Gallen's 8.7 percent clip was a smidge worse than average. Yielding only 13 homers in 148 frames kept Gallen's ERA in check, but if the 2025 baseball is livelier than the 2024 version, Gallen's ratios could suffer, unless he returns to a lower walk rate. Gallen's velocity was in sync with past seasons, so it's a matter of throwing more strikes. In 2023, 64.5 percent of his pitches were strikes, compared to only 61.9 percent last season. There was a time when Gallen fanned 28 percent of batters and was a back end SP1. He's now a solid SP3, with SP2 upside if he can throw more pitches in the zone.

Gallen had a fantastic season and received some deserved votes for the Cy Young Award as he helped carry the Diamondbacks to their improbable World Series run. Most of his performance indicators were right in line with 2022 but better run support helped raise his wins while a near full-run jump in his ERA can be excused by the BABIP regression which we expected would come after his rather fortunate .237 BABIP in 2022. Simply put, there is not a performance issue to be concerned with as much as a workload concern. Gallen ended up throwing 243.2 innings in 2023, which was almost exactly double what he threw just two seasons ago. He managed a 52% increase in workload just fine from 2021 to 2022, but now we add another 32% increase in workload along with the stress of working in the postseason for the first time and we cannot help but wonder about the impact of that for 2024. 2023 was an excellent season, but it would not surprise us to see Gallen take a step back this season.

For the first time in his career, Gallen avoided the injury bug, logging 31 starts and 184 innings. He recorded a career best 20.3% K-BB% mark, mostly due to a personal best 6.6% walk rate. Gallen's ratios benefited from a .237 BABIP as well as a 9.1% HR/FB mark. However, even if his 2.54 ERA was achieved with a boost from Lady Luck, Gallen's 3.05 FIP, 3.32 xFIP and 3.32 SIERA are all still excellent, softening the landing when the regression monster rears its ugly head. Gallen's pitch mix didn't change, but he threw his four-seam fastball, slider and curveball a little harder, increasing effectiveness so strikeouts should tick up with continued health. Gallen isn't off the injury concern hook but coming off a healthy season merits fantasy anchor consideration. There is a stigma about drafting pitchers from second-division teams, but the Diamondbacks offense is on the upswing, so wins are on the table.

Gallen endured an injury-riddled first half, beginning with a hairline fracture in his right arm initially thought to be more serious, followed by a sprained right elbow and hamstring strain. He headed into the break with only nine starts. Gallen gathered 14 in the second half, registering a 4.37 ERA and 1.24 WHIP with 90 punch outs in 80.1 innings, but he also walked 18 and surrendered 14 homers in that span. Eight of the homers came on a slider or changeup. Together, he threw those secondary offerings only one-third of the time, so the home run surplus seems more fluky than worrisome. Gallen is still just 26-years-old, so there's plenty of time to regain near-ace status. Last season's injuries provide pause, and his availability for Opening Day is in question due to some offseason shoulder issues. Gallen isn't expected to miss much time if any, but it remains a concern coming off the 2021 injuries If helium floated Gallen out of your range the past couple of seasons, the price is right to get back in, assuming he's healthy.

The Marlins have a good corps of starters, but it looks like they may have let an ace get away when they traded Gallen to Arizona at the 2019 trade deadline. Gallen has been one of the most effective starting pitchers in the game since he broke into the majors that season. A third-round pick in 2016, Gallen has faced 625 batters in the big leagues and pitched to a 2.78 ERA, 1.17 WHIP and 178:61 K:BB. He has a balanced pitch mix, utilizing his four-seamer, cutter, curveball and changeup all at least 16% of the time. His cutter has good horizontal break, his changeup has good downward movement and he can command the ball well in and around the zone. The ERA estimators suggest some performance giveback is imminent and it is best to count on some, though Gallen has routinely outperformed his estimators in pro ball. Remember Chase Field has become a pitchers' park since the humidor was installed.

Gallen impressed in his first glimpse of major-league action with the Marlins last season and was surprisingly traded to the Diamondbacks at the end of July. While the deal means that Gallen is now pitching in the stronger NL West, he also has a more productive offense powering him and a much better defense behind him. Although the right-hander only throws his fastball 92.9 mph on average, he has three strong secondary pitches and plus command. The 24-year-old posted a career-high 171.1 innings between the majors and minors last year before being shut down at the end of September, so workload should not be a major concern for 2020. Gallen may not overpower hitters with his velocity, but he can rack up strikeouts and the ingredients are there for him to take a leap. The hype train has already left the station, however, so know you're going to have to pay full freight if you want to go along for the ride.

More Fantasy News

Throws live BP session

PArizona Diamondbacks

February 21, 2026

Gallen threw a live batting-practice session Friday, Steve Gilbert of MLB.com reports.