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

Getty Images 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…