The Buckeyes and Spartans each won, but Michigan's loss led to Wisconsin's gain in the jockeying for Big Ten tournament seeding.
Penn State will play fifth-seeded Michigan on Thursday. The Nittany Lions might have been locked into the last seed, but they still challenged Wisconsin.
They're 2-2 since starting 0-14 in conference, and the tough play extended into the regular-season finale at an energized Jordan Center.
After starting 5 of 6 from the field, Penn State tightened up defensively to hold the Badgers to 5 of 21 the rest of the first half. The Nittany Lions' one-two guard punch of Marshall and Newbill each scored 10 for a 25-24 halftime lead, and the game settled into a see-saw affair the rest of the way.
"I don't think we started the game with a sense of urgency," Chambers said. "But we definitely picked it up after the first media timeout."
Foul trouble hurt Penn State in the closing minutes though. The Nittany Lions had trouble scoring with Marshall on the bench with four fouls until re-entered with about three minutes left and scored Penn State's next four points to stay within one possession of the lead.