Efficiency margin: points per possession (PPP) minus opponent PPP (more about these stats) All games, thru January 16 1. Illinois (+0.25) 2. Ohio State (+0.20) 3. Indiana (+0.19) 4. Wisconsin (+0.18) 5. Michigan (+0.15) 6. Iowa (+0.15) 7. Michigan State (+0.11) 8. Minnesota (+0.08) 9. Northwestern (+0.07) 10. Penn State (+0.05) 11. Purdue (-0.05)