MADISON, Wis. — Ohio State’s latest defeat was more than just disappointing to coach Thad Matta. It left him at a loss to explain what’s wrong with his team. No. 20 Wisconsin shot a season-best 53 percent Sunday in a 71-49 rout of the 13th-ranked Buckeyes. It was the third defeat in four games for Ohio State, with the lone win a lackluster performance against Northwestern.