Michigan State discovered just how tough things can be without do-everything star Denzel Valentine.

Mike Gesell scored a career-high 25 points and Iowa cruised past top-ranked Michigan State 83-70 in Iowa City on Tuesday night, handing the Spartans their first loss of the season.

Peter Jok had 19 points for the Hawkeyes (10-3, 1-0 Big Ten), which toppled a No. 1 team for the first time in 16 years.

Iowa never trailed in what turned out to be a surprisingly easy victory over the Spartans (13-1, 0-1).

The Hawkeyes led by as many as 19 points in stopping a nine-game losing streak against Michigan State.

"It was one of the rare times in my career I thought we got, for [lack] of a better choice of words, punked," Michigan State coach Tom Izzo said. "We got outhustled."

Eron Harris scored 21 points to lead the Spartans. They were playing their second game without Valentine — their leader in scoring, rebounds and assists — and their first since Izzo's father, Carl, died Monday.

But Izzo refused to use Valentine's absence as an excuse, pointing instead to what he called a "disappointing effort."

"Zero," Izzo said about how much Valentine not playing hurt the Spartans. "That had something to do with not making baskets. But it had nothing to do with the effort you give."

No. 14 Purdue 61, Wisconsin 55: Seven-foot center A.J. Hammons is thriving under pressure off the bench for No. 14 Purdue.

The senior big man took control in the paint down the stretch and took advantage of younger Wisconsin players guarding him in the post.

Hammons scored 24 points, Dakota Mathias hit two three-pointers in the final 1 minute, 19 seconds and the Boilermakers held on for a six-point victory over the Badgers in Madison, Wis.

"I don't know if he understands it's pressure," Purdue coach Matt Painter said of Hammons. "The game has slowed down for him a little bit."

The Boilermakers (13-1, 1-0 Big Ten) stopped a four-game losing streak to the Badgers (8-6, 0-1), who lost their first conference game under interim coach Greg Gard.

But Purdue needed the two late threes by Mathias after Wisconsin had narrowed an 11-point deficit to 52-49 with 1:40 left on a short jumper by Grand Rapids, Minn., native Alex Illikainen.