| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 0 | 9 | 0.000 | (0,0) | 0.000 | --bye-- |
| 1 | 7 | 0.500 | (1,0) | -0.500 | W Illinois | 52 to 3 | 518 | 248 |
| 2 | 9 | 3.508 | (2,0) | 2.508 | Duke | 45 to 19 | 27 | 30 |
| 3 | 48 | 1.692 | (3,0) | 0.692 | W Michigan | 38 to 0 | 193 | 56 |
| 4 | 43 | 1.653 | (3,1) | 1.153 | Indiana | 10 to 63 | 12 | 1 |
| 5 | 18 | 2.163 | (4,1) | 1.563 | USC | 34 to 32 | 24 | 14 |
| 6 | 10 | 2.238 | (5,1) | 1.571 | Purdue | 43 to 27 | 65 | 111 |
| 7 | 17 | 2.130 | (5,2) | 1.701 | Ohio St | 16 to 34 | 3 | 4 |
| 8 | 19 | 2.026 | (5,2) | 1.597 | --bye-- |
| 9 | 30 | 1.854 | (5,3) | 1.604 | Washington | 25 to 42 | 14 | 23 |
| 10 | 24 | 1.921 | (6,3) | 1.588 | Rutgers | 35 to 13 | 91 | 75 |
| 11 | 22 | 1.929 | (6,3) | 1.595 | --bye-- |
| 12 | 22 | 1.953 | (7,3) | 1.553 | Maryland | 24 to 6 | 101 | 114 |
| 13 | 31 | 1.817 | (7,4) | 1.544 | Wisconsin | 10 to 27 | 56 | 59 |
| 14 | 25 | 1.850 | (8,4) | 1.517 | Northwestern | 20 to 13 | 56 | 48 |
| 15 | 24 | 1.874 | (8,4) | 1.541 | --bye-- |
| 16 | 24 | 1.883 | (8,4) | 1.549 | --bye-- |
| 17 | 22 | 1.902 | (8,4) | 1.569 | --bye-- |
| 18 | 24 | 1.918 | (8,4) | 1.584 | --bye-- |
| 19 | 19 | 1.969 | (9,4) | 1.584 | Tennessee | 30 to 28 | 42 | 42 |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |