Brown scored 12 points and grabbed 13 rebounds for the Phoenix (15-14, 10-9 Horizon League), who closed out the regular season on a five-game winning streak. Greg Mays added 13 points, and Sykes had six assists.
The Flames, who lost their third in a row, will be the ninth seed in the Horizon League tournament.
Green Bay outshot Illinois-Chicago 45 percent (24 of 53) to 37 percent (22 of 60) and outrebounded the Flames 42-33.
The Phoenix swept the season series, having won 71-68 on Dec. 1 in Green Bay.
- Green Bay
- Horizon League