St. Joseph (13-5) is now 2-2 on its current road trip that wraps up Wednesday evening with another contest against Omaha.
Miles Gully pitched into the sixth inning for the first time this summer, but suffered his first loss allowing four runs on five hits and three walks.
The Mustangs offense didn't give their starter much to work with -- Hayden Steele drove in a run on a second inning double, and Lucas Powers scored on an error in the eighth.
St. Joe won't return to Phil Welch Stadium until Thursday when they begin a four-game home stand.
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