Defensive efficiency: opponent points per possession (Opp. PPP--more about this stat) All games, thru January 8 1. Iowa (0.81) 2. Illinois (0.84) 3. Minnesota (0.90) 4. Northwestern (0.91) 5. Indiana (0.92) 6. Wisconsin (0.94) 7. Michigan (0.94) 8. Ohio State (0.97) 9. Penn State (1.01) 10. Purdue (1.02) 11. Michigan State (1.02)