Green Bay out-scored Milwaukee by eight points in each half to take a 16-point victory over the Panthers 90-74 on Friday night.
Milwaukee got 18 points from both Darius Roy and Bryce Barnes, as well as 17 points from Jake Wright, but couldn't overcome the Phoenix in the Horizon League showdown.
Green Bay was led in scoring by Cody Schwartz with 18 points. Four total Phoenix players reached double figures.
The win moved Green Bay one spot ahead of Milwaukee in the Horizon League standings. It also gives the Phoenix a regular-season sweep of the Panthers in 2018-19, having also won the December meeting between the schools.