Ben Brust scored 18 points, Sam Dekker added 17 and No. 4 Wisconsin used a 20-0 run in the first half to easily beat No. 23 Illinois 95-70 on Wednesday night.
The Badgers improved to 16-0 (3-0 Big Ten), the best start in school history.
Wisconsin shot 53 percent from the field in the first half to open up a 25-point lead by halftime. The Illini (13-3, 2-1) stumbled badly in their debut this year as a Top 25 team and lost a sixth straight to their border rival.
Rayvonte Rice led Illinois with 19 points on 7-of-21 shooting.
The Illini missed 13 straight shots, some on easy looks, while Wisconsin methodically wore them down inside and on the perimeter during the big first-half run.