Zac Gallen's May Struggles Raise Concerns for Arizona Rotation
Gallen closed May with a 7.04 ERA and is averaging under 5 innings per start in 2026, ranking among the worst qualified starters in MLB.
Zac Gallen finished May with a 7.04 ERA across 6 starts, allowing 24 earned runs in 30.2 innings with a 1.57 WHIP. His season ERA of 5.16 ranks fifth worst among qualified MLB pitchers. After allowing just 2 home runs in his first 6 starts, Gallen has surrendered 8 over his last 5. He is also averaging fewer than 5 innings per start this season, limiting his value as a rotation anchor.
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Gallen vs. Kirby as D-backs Visit Division-Leading Mariners
Arizona sends Zac Gallen to the mound against George Kirby in Seattle, with both teams' full starting lineups confirmed.