Bryn Forbes has been a good player for No. 5 Michigan State. Tom Izzo, though, is not satisfied with that.

Forbes scored 17 points to help the Spartans rout Illinois 79-54 on Thursday night for their second consecutive victory without Denzel Valentine.

"He's got to become a great player," Izzo said.

Forbes made three three-pointers and had three assists, one rebound, one steal and one turnover.

"I didn't think Bryn had his best game," Izzo lamented. "He has been playing a lot better defensively."

The Spartans (15-1, 2-1 Big Ten) missed Valentine for a fourth game in a row. The senior guard participated in pregame warmups, nearly three weeks after having surgery on his left knee.

"Could've played, wanted to play, but he wasn't quite there yet," Izzo said.

The Illini (8-8, 0-3) didn't have scoring leader Kendrick Nunn. He stayed in Illinois for the birth of his child, a boy.

No. 20 Purdue 87, Michigan 70: A.J. Hammons scored 17 points and had four blocks while Rapheal Davis added 16 points to lead the Boilermakers (14-2, 2-1) over the Wolverines. Purdue has won eight of 10 and are 10-1 at home this season.

Muhammad-Ali Abdur-Rahkman scored a career-high 25 points for Michigan (12-4, 2-1) which had its six-game winning streak ended.