Gallen (1-3) took the loss against Pittsburgh on Thursday, pitching six innings during which he gave up four runs on six hits and two walks while striking out five batters.
Gallen served up a solo homer to the second batter he faced but was able to make it through four frames with just that one run on his ledger. However, the veteran struggled late in this outing, allowing four straight batters to reach with two outs in the fifth frame to yield two runs before giving up another run on a solo homer in the sixth. Gallen was at least better than in his previous start, when he gave up six runs over 3.2 innings against the Cubs, but he's now at a mediocre 4.70 ERA with just one victory through eight starts on the season.
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Diamondbacks' Zac Gallen: Mauled by Cubs
Rotowire
Gallen (1-2) took the loss Friday, coughing up six runs on seven hits and three walks over 3.2 innings as the Diamondbacks were downed 6-5 by the Cubs. He struck out three.
Chicago ambushed the right-hander for three runs in the first inning, and another three-spot in the fourth chased Gallen from the game after 95 pitches (57 strikes). The performance ended a stretch of five straight starts in which he'd given up three runs or fewer, and Gallen will take a 4.45 ERA, 1.52 WHIP and 20:10 K:BB through 32.1 innings into his next outing, which lines up to come at home next week against the Pirates.
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Diamondbacks' Zac Gallen: Cleared to start Friday
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The Diamondbacks list Gallen (shoulder) as their starting pitcher for Friday's game against the Cubs, Jack Sommers of SI.com reports.
Gallen had to be removed from his last outing after he was struck in the right shoulder by a comebacker, but he threw a bullpen session Wednesday without issue and will not have to miss a turn in the rotation. The veteran right-hander should be ready for a normal workload at Wrigley Field.
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Diamondbacks' Zac Gallen: Cleared for mound work
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Gallen (shoulder) is expected to throw a bullpen session Wednesday, Steve Gilbert of MLB.com reports.
Gallen showed up at the ballpark Monday and played catch two days after being removed from his start in Saturday's 6-4 loss to the Padres. The right-hander expects to make his next start, which will likely come Friday against the Cubs at Wrigley Field.
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Diamondbacks' Zac Gallen: Should make next start
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Manager Torey Lovullo said Sunday that Gallen (shoulder) was feeling better, and the club is "encouraged" the right-hander will make his next turn through the rotation, Nick Piecoro of The Arizona Republic reports.
Gallen was removed from his start against the Padres on Saturday after being hit by a comebacker on his throwing shoulder, ending his day after three scoreless frames. The 30-year-old was diagnosed with a contusion, and it appears he'll be able to take the mound for his next turn through the rotation this weekend against the Cubs. Gallen's status should receive more clarity in the next day or two, which is when he would typically throw his between-starts bullpen session.
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Diamondbacks' Zac Gallen: Exits game with shoulder injury
Rotowire
Gallen was removed from Saturday's start against the Padres due to a right shoulder contusion, Jody Jackson of Bally Sports Arizona reports.
Gallen was hit by a comebacker in the shoulder early in Saturday's contest, and while he initially stayed in the game, he was ultimately pulled at the end of the third inning. The 30-year-old finished his outing having allowed one hit and no walks while striking out three across three scoreless frames. The Diamondbacks should have an update on Gallen's injury once he undergoes more tests, but for now his next turn through the rotation is up in the air.
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Diamondbacks' Zac Gallen: Works around traffic in no-decision
Rotowire
Gallen took a no-decision Saturday against the Blue Jays, allowing two runs on nine hits and no walks in 5.2 innings. He struck out three.
Gallen was aggressive in attacking the zone Saturday, perhaps to a fault, considering he gave up a season-high nine hits while pouring in 63 of his 88 pitches for strikes. Although the veteran right-hander has managed to limit the damage while posting a 3.51 ERA on the year, he hasn't been particularly effective at preventing traffic while logging a 1.48 WHIP over his first 25.2 innings. Gallen has also fanned fewer than five in four of his first five starts, so he'll be looking for more punchouts his next time out versus San Diego.
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Diamondbacks' Zac Gallen: Falters late in no-decision
Rotowire
Gallen did not factor into the decision in Sunday's 4-3 win over the Phillies, allowing three runs on eight hits and one walk with two strikeouts over five innings.
Gallen opened with five scoreless frames before allowing five straight hits and three runs without recording an out in the sixth. It was a tough finish to an otherwise solid outing, though he generated just four swinging strikes on 84 pitches and yielded 15 hard-hit balls. The 30-year-old owns a 3.60 ERA, 1.45 WHIP and 11:7 K:BB across 20 innings in the early going and lines up for a home matchup against the Blue Jays next weekend.
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Diamondbacks' Zac Gallen: Limits Mets in no-decision
Rotowire
Gallen did not factor into the decision Tuesday against the Mets, allowing two runs (one earned) on five hits and four walks while striking out five over five innings.
Gallen ran into quick trouble, allowing three consecutive singles to open the game, but he managed to limit the damage to just one run on a sacrifice fly. The right-hander settled in nicely after the rocky start, allowing only two hits over his final four innings while pitching effectively through traffic. Though he wasn't especially efficient, issuing four walks and needing 95 pitches (54 strikes) to get through five innings, he kept Arizona in position to win before the bullpen let the lead slip away. Gallen now holds a 3.00 ERA, 1.33 WHIP and 9:6 K:BB through his first three outings of the season.
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Diamondbacks' Zac Gallen: Makes penultimate spring start
Rotowire
Gallen allowed three runs on seven hits while striking out one over 2.2 innings in Saturday's spring start against the Giants. He also hit a batter.
Gallen made his third Cactus League start and has one more to go before taking the ball Opening Day. He was pulled with two outs in the third inning and re-entered to begin the fourth but was gone for good after Daniel Susac jumped on a changeup left up in the zone for a home run. The right-hander told Jack Sommers of SI.com that he was working on his sinker and trying to improve the consistency of his changeup. Instead of tinkering with his arsenal in his final spring start, Gallen plans to approach it as he would a regular-season game, per Jose M. Romero of the Arizona Republic.
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Diamondbacks' Zac Gallen: Set for Opening Day assignment
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The Diamondbacks named Gallen as their starter for Opening Day against the Dodgers on March 26.
Merrill Kelly had previously been tapped to start Opening Day for Arizona, but he will not be ready at that point as he recovers from a back injury. As a result, Gallen -- who re-signed with the Diamondbacks at the start of spring training -- will be making his fourth consecutive Opening Day start. Gallen had a disappointing 2025 campaign, finishing with a 4.83 ERA and 175:66 K:BB over 192 innings.
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Diamondbacks' Zac Gallen: Returning to Arizona
Rotowire
Gallen signed a one-year, $22.025 milion contract with the Diamondbacks on Friday, Alden Gonzalez of ESPN.com reports.
After not receiving the level of interest he might have expected on the open market, Gallen will officially return to the Diamondbacks for another season on a contract that will pay him the same amount as the qualifying offer he declined earlier this winter. The 30-year-old righty is coming off the worst season of his big-league career, as he finished 2025 with a 4.83 ERA and 1.26 WHIP while serving up 31 homers -- tied for fourth-most in MLB. He remains a reliable option from a health standpoint, however, making at least 31 starts in three of the past four years.
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Zac Gallen: Receives qualifying offer
Rotowire
The Diamondbacks extended a one-year, $22.05 million qualifying offer to Gallen on Thursday, Jeff Passan of ESPN.com reports.
Gallen is coming off the worst season of his MLB career, with his 4.83 ERA, 15 losses, 8.2 K/9 and 1.5 HR/9 all being career worsts. Though it's unclear just how large the market will be for Gallen after a down year, he could decline the qualifying offer in hopes of securing a long-term deal ahead of his age-30 campaign. If he does so and then signs elsewhere, Arizona would receive draft compensation.
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Diamondbacks' Zac Gallen: Poor end to rough season
Rotowire
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.
A Fernando Tatis grand slam in the fourth inning flipped this game in the Padres' favor. Gallen was pushed back a day after dealing with fatigue stemming from an illness in recent weeks, but his final start of 2025 was reflective of his year as a whole. The right-hander finishes the season at a career-worst 4.83 ERA while adding a 1.26 WHIP and 175:66 K:BB over 192 innings through 33 starts. He also gave up a career-high 31 homers, an area in which the 30-year-old will need to improve if he is to get back on track in 2026.
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Diamondbacks' Zac Gallen: Pushed to Friday due to fatigue
Rotowire
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.
It was Gallen's turn Thursday versus the Dodgers, but he's dealt with an illness during his last two starts that's sapped his strength. His performance in those outings appeared unaffected, as the righty yielded four runs with a 15:3 K:BB over 13 innings, but the Diamondbacks nonetheless made the decision to give Gallen an extra day of rest. Jalen Beeks is opening and Nabil Crismatt is slated for bulk relief Thursday.
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Diamondbacks' Zac Gallen: Sharp in Monday's win
Rotowire
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.
Gallen was stingy despite throwing just 57 of 96 pitches for strikes, with the lone run on his line being the result of a Casey Schmitt solo home run in the third inning. This was Gallen's fifth quality start in his last six outings, the lone exception being his five-run appearance in San Francisco last week. Gallen is now at a 4.73 ERA, 1.25 WHIP and 163:61 K:BB across 180.2 innings over 31 starts this season, though he has a 2.68 ERA in 53.2 innings through his last nine outings. He's projected for a tough home start versus the Phillies this weekend.
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Diamondbacks' Zac Gallen: Quality start in no-decision
Rotowire
Gallen allowed one run on four hits and one walk over six innings while not factoring into the decision in Sunday's 6-1 loss to the Reds. He struck out seven.
The Arizona right-hander impressed over this 95-pitch outing, as he tallied a quality start for the fourth time out of his last five appearances. The only blemish on Gallen's line came in the sixth when Noelvi Marte lashed a run-scoring triple -- the only extra-base knock Gallen conceded. Despite an ugly 5.13 ERA and 1.31 WHIP across 156 total innings, the 30-year-old has pitched better since the All-Star break, producing a 4.39 ERA, 1.15 WHIP and 31:8 K:BB over 41 frames. Gallen lines up for a difficult test in his next start, which currently lines up to come on the road against the Dodgers next weekend.
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Diamondbacks' Zac Gallen: Yields two homers in loss
Rotowire
Gallen (9-13) allowed three runs on five hits and struck out three without walking a batter over six innings to take the loss versus the Guardians on Monday.
Gallen has recorded a quality start in three of his four outings in August, though his effort Monday wasn't enough to get a win. He allowed a solo home run to C.J. Kayfus in the second inning and gave up a two-run blast to Brayan Rocchio in the fifth, making this the first time in five starts Gallen has given up multiple homers. The veteran right-hander is now at a 5.28 ERA, 1.33 WHIP and 134:52 K:BB through 150 innings over 26 starts this season. Gallen is projected to make his next start at home versus the Reds.
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Diamondbacks' Zac Gallen: Goes five innings in no-decision
Rotowire
Gallen did not factor into the decision Wednesday against the Rangers, allowing three runs on five hits and two walks over five innings. He struck out one.
It's the first time in five starts that Gallen's failed to make it through six innings -- the right-hander had won his previous two outings, giving up just three runs over 12 innings in that span. Overall, Gallen's ERA sits at 5.31 with a 1.35 WHIP and 131:52 K:BB across 25 starts (144 innings) this season. He's currently lined up to face the Guardians at home his next time out.
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Diamondbacks' Zac Gallen: Collects ninth win
Rotowire
Gallen (9-12) allowed one run on four hits and three walks while striking out six over six innings to earn the win over the Rockies on Friday.
Gallen has covered at least six innings in six of his last seven starts, earning wins in all four of his quality starts in that span. He limited the damage to a Kyle Karros RBI single in the second inning of this contest, though the Diamondbacks' lead was never in danger. Gallen is now at a 5.31 ERA, 1.35 WHIP and 130:50 K:BB through 139 innings across 24 starts this season. The veteran right-hander's next outing is projected to be on the road versus the Rangers.
