Zac Gallen

Zac Gallen

29-Year-Old PitcherSP
Arizona Diamondbacks
2025 Fantasy Outlook
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. Read Past Outlooks
RANKS
Rest of Season From Preseason
#129
ADP
Signed a one-year, $13.5 million contract with the Diamondbacks in January of 2025.
Strikes out 10 in win
PArizona Diamondbacks
July 1, 2025
Gallen (6-9) allowed two runs (one earned) on five hits and struck out 10 without walking a batter over seven innings to earn the win over the Giants on Tuesday.
Analysis
Gallen had allowed at least four runs in eight of his previous nine starts, pitching to a 6.97 ERA in that span. He was much better Tuesday, overcoming a shaky second inning to put together one of his best starts of the season. Gallen's extended slump is still evident in his 5.45 ERA, 1.37 WHIP and 98:42 K:BB through 104 innings, but he could turn things around, as those ratios are the worst of his career. The right-hander will look to build some positive momentum in his next start, tentatively scheduled for this weekend at home versus the Royals.
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Pitching Stats
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2025 MLB Game Log
2025
2024
2023
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2020
2019
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2024 MLB Game Log
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2022 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
95
Last 10 Games
94
Last 5 Games
94
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
 
 
-19%
BAA vs RHP
2024
 
 
-12%
BAA vs LHP
2023
 
 
-5%
BAA vs RHP
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .244 941 227 75 209 40 8 30
Since 2023vs Right .236 974 247 68 212 49 3 25
2025vs Left .275 227 44 24 55 13 1 9
2025vs Right .223 221 54 18 45 5 2 11
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
 
 
-21%
ERA at Home
2025
 
 
-8%
ERA on Road
2024
 
 
-16%
ERA at Home
2023
 
 
-44%
ERA at Home
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 3.52 1.20 240.2 22 11 0 9.8 2.6 0.8
Since 2023Away 4.47 1.25 221.1 15 13 0 8.6 3.0 1.4
2025Home 5.66 1.51 55.2 2 5 0 8.4 4.4 1.5
2025Away 5.21 1.20 48.1 4 4 0 8.6 2.8 2.0
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
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
2.33
 
K/9
8.5
 
BB/9
3.6
 
HR/9
1.7
 
Fastball
93.3 mph
 
ERA
5.45
 
WHIP
1.37
 
BABIP
.291
 
GB/FB
1.11
 
Left On Base
65.8%
 
Exit Velocity
84.4 mph
 
Barrels/BBE
8.3%
 
Spin Rate
2238 rpm
 
Balls Hit 95+ MPH
31.3%
 
Swinging Strike
10.4%
 
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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Recent RotoWire Articles Featuring Zac Gallen See More
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Past Fantasy Outlooks
2024
2023
2022
2021
2020
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
Struggles continue Wednesday
PArizona Diamondbacks
June 25, 2025
Gallen (5-9) took the loss Wednesday as the Diamondbacks fell 7-3 to the White Sox, coughing up five runs on eight hits and a walk over 5.1 innings. He struck out two.
Analysis
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Escapes Coors with win
PArizona Diamondbacks
June 21, 2025
Gallen (5-8) picked up the win Friday, surrendering seven runs on 10 hits and a walk over five innings in a 14-8 victory over the Rockies. He struck out five.
Analysis
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Fades in seventh inning
PArizona Diamondbacks
June 14, 2025
Gallen allowed four runs on six hits and four walks while striking out six over 6.1 innings in a no-decision Saturday versus the Padres.
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Allows three homers in loss
PArizona Diamondbacks
June 8, 2025
Gallen (4-8) took the loss against the Reds on Sunday, allowing four runs on six hits and three walks with five strikeouts over 6.2 innings.
Analysis
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Picks up fourth win
PArizona Diamondbacks
June 4, 2025
Gallen (4-7) earned the win Tuesday in Atlanta after giving up three runs (one earned) on four hits and one walk over seven innings. He struck out four.
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Latest Fantasy Rumors
Trade option for CHC?
PArizona Diamondbacks
June 14, 2025
Gallen could be a trade target for the Cubs ahead of the deadline, Jim Bowden of The Athletic speculates.
Analysis
The season-ending elbow injury of Justin Steele, plus the fact that other potential starters are on the injured list, means the Cubs should undoubtedly add a starter or maybe two if they want to make a deep playoff run in October. Gallen is one of two Arizona pitchers the Cubs might target, alongside Merrill Kelly. Gallen might have some suitors in the trade market, but he needs to start pitching better to deliver the Diamondbacks a solid package in return. The seven-year veteran owns a career-worst 5.15 ERA in 14 starts in 2025.
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