Zac Gallen
30-Year-Old
Free Agent
2025 Stats
W-L
13-15
ERA
4.83
WHIP
1.26
K
175
SV
0
2026 Projections
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 surrendured 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 stranding runners with his LOB% coming in ten percentage points below his career average. Gallen efforted to expand 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 to simply his offerings and 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. Read Past Outlooks
Signed a one-year, $13.5 million contract with the Diamondbacks in January of 2025.
Rejects qualifying offer
Gallen rejected the Diamondbacks' one-year, $22.025 million qualifying offer Tuesday, Jon Heyman of the New York Post reports.
Analysis
The decision was anticipated, and Gallen will now seek a multi-year contract on the free-agent market. If he departs Arizona, the Diamondbacks will receive a draft pick as compensation. Gallen posted a career-worst 4.83 ERA in 2025, but he had a career 3.29 ERA with a 26.6 percent strikeout rate coming into the season. The 30-year-old should have little trouble landing a lucrative multi-year contract.
The decision was anticipated, and Gallen will now seek a multi-year contract on the free-agent market. If he departs Arizona, the Diamondbacks will receive a draft pick as compensation. Gallen posted a career-worst 4.83 ERA in 2025, but he had a career 3.29 ERA with a 26.6 percent strikeout rate coming into the season. The 30-year-old should have little trouble landing a lucrative multi-year contract.
Pitching Stats
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2025 MLB Game Log
2025
2024
2023
2022
2021
2020
2019
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
95
Last 10 Games
98
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+
What part of the game does Zac Gallen generally pitch?
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
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2023vs Left | .242 | 259 | 85 | 246 | 33 |
| Since 2023vs Right | .234 | 292 | 82 | 251 | 33 |
| 2025vs Left | .256 | 76 | 34 | 92 | 12 |
| 2025vs Right | .223 | 99 | 32 | 84 | 19 |
| 2024vs Left | .222 | 77 | 25 | 61 | 7 |
| 2024vs Right | .252 | 79 | 29 | 72 | 6 |
| 2023vs Left | .244 | 106 | 26 | 93 | 14 |
| 2023vs Right | .232 | 114 | 21 | 95 | 8 |
Home/Away Pitching Splits
Since 2023
-24%
ERA at Home
2025
-11%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |
|---|---|---|---|---|---|
| Since 2023Home | 3.46 | 1.15 | 283.2 | 9.6 | 2.5 |
| Since 2023Away | 4.56 | 1.27 | 266.1 | 8.3 | 3.0 |
| 2025Home | 4.56 | 1.25 | 98.2 | 8.6 | 3.3 |
| 2025Away | 5.11 | 1.28 | 93.1 | 7.8 | 2.9 |
| 2024Home | 3.36 | 1.19 | 83.0 | 9.8 | 2.7 |
| 2024Away | 4.02 | 1.35 | 65.0 | 9.1 | 4.0 |
| 2023Home | 2.47 | 1.03 | 102.0 | 10.6 | 1.6 |
| 2023Away | 4.42 | 1.20 | 108.0 | 8.3 | 2.4 |
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.
* 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
2.65K/9
8.2BB/9
3.1HR/9
1.5Fastball
93.6 mphERA
4.83WHIP
1.26BABIP
.284GB/FB
1.31Left On Base
67.0%Exit Velocity
83.7 mphBarrels/BBE
6.5%Spin Rate
2209 rpmBalls Hit 95+ MPH
27.8%Swinging Strike
9.8%Prospect Rankings History
Advanced Pitching Stats
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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.
More Fantasy News
Receives qualifying offer
The Diamondbacks extended a one-year, $22.05 million qualifying offer to Gallen on Thursday, Jeff Passan of ESPN.com reports.
Analysis
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Poor end to rough season
Gallen (13-15) allowed six runs (five earned) on seven hits and three walks while striking out three over 4.1 innings to take the loss versus the Padres on Friday.
Analysis
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Pushed to Friday due to fatigue
Gallen's next start was pushed back a day to Friday in San Diego due to fatigue/illness, Jody Jackson of Bally Sports Arizona reports.
Analysis
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Strikes out nine in win
Gallen (13-14) allowed three runs on four hits and two walks while striking out nine over seven innings to earn the win Saturday over the Phillies.
Analysis
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Sharp in Monday's win
Gallen (12-14) allowed one run on two hits and a walk while striking out six over six innings to earn the win over the Giants on Monday.
Analysis
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Latest Fantasy Rumors
Likely to decline qualifying offer
According to Alex D'Agostino of SI.com, the Diamondbacks are expected to extend the qualifying offer to Gallen for 2026 this offseason, which the right-hander is expected to decline.
Analysis
The 30-year-old produced the worst season of his career in 2025 with a 4.83 ERA across 192 innings, but his prior MLB track record will be enough for Arizona to still extend him the qualifying offer. Before the disappointing campaign, Gallen had a 3.29 ERA and 9.8 K/9 through his first six big-league seasons, which perhaps is enough to net him a sizable multi-year contract his winter.
The 30-year-old produced the worst season of his career in 2025 with a 4.83 ERA across 192 innings, but his prior MLB track record will be enough for Arizona to still extend him the qualifying offer. Before the disappointing campaign, Gallen had a 3.29 ERA and 9.8 K/9 through his first six big-league seasons, which perhaps is enough to net him a sizable multi-year contract his winter.