College football winners, losers in Week 4: Iowa emerges as Big Ten title threat, John Mateer struggles again

Week 4 marks the formal start of conference play across college football, and the big-time matchups are delivering. No. 17 Iowa pulled a stunner against No. 18 Michigan to win at Michigan Stadium for the first time since 2010 on the last play.

But while there's been plenty of highs, a few high-profile players struggled in big moments. Trinidad Chambliss was unable to keep up the magic against Florida, while Oklahoma's John Mateer collapsed against Georgia. The ACC race also took a wild turn after Wake Forest upset Louisville.

There are still several high-profile matchups left on the board. No. 10 LSU hopes to get back on track against No. 23 Texas A&M in Baton Rouge. No. 20 Oregon and No. 12 USC play with control of the Big Ten title race on the line. Here are the biggest winners and losers of Week 4.

Iowa's win against No. 18 Michigan to stay undefeated was a perfect Kirk Ferentz football game. The Hawkeyes puttered about for the first 40 minutes of play, only staying within striking distance because of a 99-yard kickoff return for a touchdown. And then, Hank Brown came to life.

The Hawkeyes got one of the great…

Original source: https://www.cbssports.com/