1. Ohio State (6-1, 4-0)
After thrashing Indiana 54-7, Buckeyes await visit from Penn State in a matchup that lost some luster after Nittany Lions lost to Illinois. Last week: 1
2. Michigan (7-0, 4-0)
Huge intrastate showdown in East Lansing, where Wolverines have beaten Michigan State in past two visits. Last week: 3
3. Michigan State (7-0, 4-0)
Spartans RB Kenneth Walker III leads the Big Ten in rushing (142.4 yards per game) and faces a Michigan defense that allows a conference-low 14.3 points per game. Last week: 4
4. Iowa (6-1, 3-1)
Hawkeyes could bolster their West hopes and deal Wisconsin a huge blow if they can win in Madison. Last week: 5