Zac Gallen of the Arizona Diamondbacks struggled mightily in a recent start versus the Seattle Mariners, allowing five runs in just five innings. the right‑hander’s four‑seam fastball proved ineffective, generating only three swings‑and‑misses while opponents rapped three home runs off him. The outing deepens concerns about whether Gallen can rebound after a career‑worst 4.83 ERA in 2025.

Gallen yields five runs in five innings vs Mariners

During the game, Gallen gave up eight hits, three of which were long balls, and a walk that eventually scored. According to the source, the five‑run total came on a mix of fastball and off‑speed offerings, with the fastball failing to generate the usual whiff rate. The performance marked a stark contrast to earlier, more gritty outings the pitcher had logged this season.

J.P. Crawford's two homers expose fastball weakness

Mariners shortstop J.P. crawford accounted for two of the three home runs off Gallen, both coming on fastball pitches that missed their intended spots. The source notes that one of those blasts was hit after a swing‑and‑miss attempt, underscoring the pitch’s diminished bite. The third homer was taken off an off‑speed or breaking ball,highlighting broader command issues.

Lovullo stresses location over velocity in Gallen's rehab

Diamondbacks manager Torey Lovullo told reporters that success for Gallen will hinge less on raw speed and more on precise fastball placement,sequencing, and selectivity. As the source reports,Lovullo emphasized that “it’s not about velocity but about where you locate the fastball,” a mantra the team hopes will guide Gallen’s adjustments moving forward.

Career‑low 6.63 K/9 raises 2026 doubts

Statistically, Gallen’s strikeout rate has slipped to a career‑low 6.63 per nine innings, a figure that aligns with his inflated ERA and recent struggles. The source points out that after posting a 4 .83 ERA in 2025, expectations for a bounce‑back in 2026 have been tempered, and this latest start adds weight to that skepticism.

Will Gallen recaim a rotation spot in 2026?

Open questions remain about Gallen’s role next season: Can he re‑establish his fastball as a reliable weapon, and will the Diamondbacks keep him in the starting rotation? The source provides no comment from Gallen himself, leaving fans to wonder whether the pitcher can adjust his approach in time for a potential 2026 resurgence.