| 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 | Ball St | 31 to 0 | 518 | 165 |
| 2 | 6 | 3.600 | (2,0) | 2.600 | S Illinois | 34 to 17 | 22 | 139 |
| 3 | 84 | 1.357 | (2,1) | 1.023 | USC | 17 to 33 | 29 | 18 |
| 4 | 92 | 1.247 | (2,2) | 1.247 | Notre Dame | 30 to 56 | 35 | 17 |
| 5 | 92 | 1.307 | (2,2) | 1.307 | --bye-- |
| 6 | 65 | 1.513 | (2,3) | 1.713 | Illinois | 27 to 43 | 10 | 24 |
| 7 | 91 | 1.357 | (2,4) | 1.691 | Minnesota | 20 to 27 | 56 | 50 |
| 8 | 93 | 1.253 | (2,5) | 1.681 | Northwestern | 0 to 19 | 42 | 55 |
| 9 | 126 | 1.057 | (2,6) | 1.557 | Rutgers | 24 to 27 | 84 | 91 |
| 10 | 121 | 1.082 | (2,7) | 1.637 | Michigan | 16 to 21 | 14 | 14 |
| 11 | | | | | Ohio St | | | 3 |
| 12 | | | | | Washington | | | 16 |
| 13 | | | | | --bye-- |
| 14 | | | | | Indiana | | | 2 |
| 15 | | | | | --bye-- |
| 16 | | | | | --bye-- |
| 17 | | | | | --bye-- |
| 18 | | | | | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |