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
#128
ADP
$Signed a one-year, $13.5 million contract with the Diamondbacks in January of 2025, avoiding arbitration.
Allows four runs Opening Day
PArizona Diamondbacks
March 28, 2025
Gallen (0-1) took the loss Thursday against the Cubs after giving up four runs on four hits and four walks over four innings. He struck out four.
ANALYSIS
Gallen finished spring training with a 2.89 ERA and 10:5 K:BB in four Cactus League outings, and his command was a bit all over the place again Thursday as he threw just 43 of 83 pitches for strikes. The right-hander will need to get on track quickly, as a matchup with the Yankees likely awaits in his second start of the season next week.
Read More News
Pitching Stats
Loading Pitching Stats...
2025
2024
2023
2022
2021
2020
2019
2025 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
2024 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
2023 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
2022 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
2021 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
2020 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
2019 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
Minor League Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Pitching Appearances Breakdown
Average Pitch Count
83
Last 10 Games
83
Last 5 Games
83
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
Even Split
2025
 
 
-77%
BAA vs RHP
2024
 
 
-12%
BAA vs LHP
2023
 
 
-5%
BAA vs RHP
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .237 724 185 54 157 28 7 22
Since 2023vs Right .238 764 195 51 168 44 1 14
2025vs Left .429 10 2 3 3 1 0 1
2025vs Right .100 11 2 1 1 0 0 0
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
 
 
-30%
ERA at Home
2025
 
 
-100%
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 3.00 1.12 189.0 20 7 0 10.2 2.2 0.6
Since 2023Away 4.27 1.26 173.0 11 9 0 8.6 3.0 1.2
2025Home 9.00 2.00 4.0 0 1 0 9.0 9.0 2.3
2025Away 0 0 0 0 0 0 0 0 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
More Splits View More Split Stats
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
1.00
 
K/9
9.0
 
BB/9
9.0
 
HR/9
2.3
 
Fastball
92.9 mph
 
ERA
9.00
 
WHIP
2.00
 
BABIP
.292
 
GB/FB
0.40
 
Left On Base
60.6%
 
Exit Velocity
0.0 mph
 
Barrels/BBE
0.0%
 
Spin Rate
0 rpm
 
Balls Hit 95+ MPH
0.0%
 
Swinging Strike
6.0%
 
Prospect Rankings History
Advanced Pitching Stats
Loading Advanced Pitching Stats...
Defensive Stats
Loading MLB Defensive Stats...
Stats Vs Today's Lineup
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
Recent RotoWire Articles Featuring Zac Gallen See More
MLB Picks: Division Winners, Pennant Winners, and World Series Prediction
Yesterday
Opening Day is here but there's still time to squeeze in MLB futures. John Venezia checks in with his MLB team futures, including a familiar pick for the World Series.
Are We Any Good At Predicting Pitcher Injuries?
2 days ago
With supposed paragon of durability George Kirby opening the year on the injured list, it's time to ask whether or not we really have any idea about which pitchers are injury-prone.
Weekly Pitcher Rankings: We Made It!
2 days ago
Tarik Skubal's Cy Young defense gets off to a tough start this weekend as he takes on the defending champions in Dodger Stadium. Where does he rank in Todd Zola's first pitcher rankings of the year?
RotoWire Roundtable: Updated Fantasy Baseball Top-300 Rankings
7 days ago
The latest update to the RotoWire Roundtable Rankings sees Jackson Chourio move into the back of the first round.
RotoWire Roundtable Rankings: Bobby Witt Claims the Top Spot
14 days ago
With Shohei Ohtani set for more days off and fewer steals this season, Bobby Witt Jr. has moved into the top spot in our Roundtable Rankings.
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
Makes final spring start
PArizona Diamondbacks
March 21, 2025
Gallen allowed one run on five hits and two walks while striking out two over 4.1 innings in Thursday's spring start against the Athletics.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Named Opening Day starter
PArizona Diamondbacks
March 20, 2025
Gallen will start Opening Day, March 27 against the Cubs, Steve Gilbert of MLB.com reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Fans three in third spring outing
PArizona Diamondbacks
March 9, 2025
Gallen allowed one run on three walks while striking out three over two hitless innings in Saturday's split-squad start against the Reds.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Feels better in second start
PArizona Diamondbacks
March 2, 2025
Gallen allowed two hits while striking out three over two scoreless innings in Saturday's spring start against the Rockies.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Makes first spring appearance
PArizona Diamondbacks
February 24, 2025
Gallen allowed one run on one hit and struck out two over one inning in Monday's spring game against Cleveland.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Latest Fantasy Rumors
Potential trade chip
PArizona Diamondbacks
November 8, 2024
The Diamondbacks might consider trading Gallen this offseason, Will Sammon and Patrick Mooney of The Athletic report.
ANALYSIS
Multiple clubs looking for rotation help reached out to the Diamondbacks at this week's general managers' meetings. While it's not clear which of their arms has drawn the most interest, Gallen, Merrill Kelly and Jordan Montgomery will all be free agents following the 2025 season. It would be difficult for Arizona to part with their best starter in Gallen since they want to be competitive next season, but he would also likely bring the best return.
See All MLB Rumors