Nigel Hayes had 14 points for the Badgers, who are now off to their best start in school history at 23-2. Wisconsin leads the Big Ten at 11-1 in conference play.
The Illini (17-9, 7-6) had a four-game winning streak snapped. Malcolm Hill scored 15 points, while Rayvonte Rice added 10.
The Badgers took control of the game with a 15-2 run sandwiched around halftime and then prevented Illinois from getting any closer than nine points the rest of the way.
No. 7 ARIZONA 86, WASHINGTON STATE 59
PULLMAN, Wash. (AP) — Brandon Ashley, Rondae Hollis-Jefferson and Kaleb Tarczewski each scored 17 points as Arizona routed Washington State.
T.J. McConnell added 14 points for Arizona (22-3, 10-2 Pacific 12), which plays WSU only once this season. The Wildcats led by 34 points after the first half.
Dexter Kernick-Drew scored 20 points and DaVonte Lacy scored 18 for Washington State (11-14, 5-8), which was coming off a win over Arizona State on Thursday. The Cougars were done in by woeful shooting in the first half.
Arizona has won two straight after being upset by Arizona State. Arizona won the rebound battle 44-23 and outscored the Cougars in the paint 46-12.
The Wildcats came out strong in the first half and took control early.
No. 11 UTAH 76, CALIFORNIA 61
SALT LAKE CITY (AP) — Jakob Poeltl had 18 points and eight rebounds, and Utah beat California for the Utes’ 17th straight home victory.
Trailing 32-26 with five minutes left before halftime, Utah closed the half on a 14-2 run and didn’t trail after the break.
Delon Wright added 16 points for the Utes (20-4, 10-2 Pac-12), while Brandon Taylor had 13.
Tyrone Wallace led Cal (16-10, 6-7) with 26 points and Jabari Bird scored 21.
No. 13 NORTHERN IOWA 68, MISSOURI STATE 57
SPRINGFIELD, Mo. (AP) — Seth Tuttle scored 22 points and Northern Iowa matched its season-high with 12 3-pointers to beat Missouri State.
The Panthers (24-2, 13-1 Missouri Valley Conference) shot 57 percent from the field (16 of 28) in the first-half, including nine of 14 from 3-point range. Northern Iowa had 14 assists and led 42-20 at the half. The lead stretched to 49-23 with 17:40 to go before Missouri State made a late push.
Jeremy Morgan and Deon Mitchell added 11 points apiece in the win for the Panthers.
Camyn Boone scored 14 points for Missouri State (9-17, 3-11 MVC), which lost for the 10th time in its last 11 games.
The victory stretched Northern Iowa’s win streak to 13-games —the fifth-longest current streak in the nation_and pulled the Panthers even for first-place in the Missouri Valley with Wichita State.