Thanks to the fine folks at ESPN Stats & Information for these helpful nuggets on Week 4 games featuring Big Ten teams ranked in the AP Top 25.
Bret Bielema took over as Wisconsin's head coach in 2006 and is 23-0 in regular-season nonconference games with the Badgers. That is tied with Joe Paterno for the second-best start by a Big Ten coach (Paterno’s nonconference streak started when Penn State began Big Ten play in 1993). Michigan's Fielding Yost has the record with 41 straight.
Nebraska has won 16 straight games against current Mountain West Conference teams and is 20-2 all-time. The last time the Huskers lost to a current MWC team was 1963 against Air Force. Wyoming is 1-14 all-time against current Big Ten teams, its only win coming against Wisconsin in 1986.
If Michigan wins this week, Brady Hoke would be the third coach in Michigan history to defeat a team that he coached the previous season. In 1901, Yost came to Ann Arbor from Stanford and promptly thumped his old team 49-0 in the first ever Rose Bowl. In 1929, Harry Kipke came to Michigan after one season as head coach at Michigan State. Michigan beat its intrastate rival 17-0 that season.
Wisconsin leads the Big Ten in scoring offense and defense, ranking in the Top 15 nationally in both categories (T-11th in offense, T-4th in defense). It joins Stanford and Texas Tech as the only other teams to rank in the top 15 in both categories.
Illinois is 3-0 for the first time since 2001. That year, the Illini went 10-2 and played in the Sugar Bowl. The previous five times the Illini started 3-0, they lost their next game. Illinois hasn't started a season 4-0 since 1951.