Wisconsin literally has one of the best rush defenses in the country. They rank fourth in the nation in yards allowed per game at less than 50. 46.3 yards to be exact. It's elite with only three teams currently better than them, and one of those teams (BYU) has only played two games against inferior opponents.
To make it more stout, Wisconsin is the only one in the top-4 that has played a ranked team in this early season. The Badgers truly could have something cooking ahead of their Big Ten schedule, which begins this week at home versus Maryland.