| 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 | Missouri St | 73 to 13 | 518 | 78 |
| 2 | 155 | 0.508 | (2,0) | -0.492 | Ga Southern | 59 to 20 | 433 | 127 |
| 3 | 29 | 2.025 | (3,0) | 1.025 | Purdue | 33 to 17 | 84 | 121 |
| 4 | 15 | 2.185 | (4,0) | 1.185 | Michigan St | 45 to 31 | 52 | 93 |
| 5 | 24 | 1.974 | (4,1) | 1.374 | Illinois | 32 to 34 | 18 | 24 |
| 6 | 24 | 2.031 | (4,1) | 1.431 | --bye-- |
| 7 | 18 | 2.139 | (5,1) | 1.473 | Michigan | 31 to 13 | 34 | 14 |
| 8 | 21 | 2.046 | (5,2) | 1.617 | Notre Dame | 24 to 34 | 11 | 17 |
| 9 | 24 | 1.989 | (5,2) | 1.560 | --bye-- |
| 10 | 18 | 2.104 | (6,2) | 1.604 | Nebraska | 21 to 17 | 46 | 46 |
| 11 | | | | | Northwestern | | | 55 |
| 12 | | | | | Iowa | | | 45 |
| 13 | | | | | Oregon | | | 13 |
| 14 | | | | | UCLA | | | 73 |
| 15 | | | | | --bye-- |
| 16 | | | | | --bye-- |
| 17 | | | | | --bye-- |
| 18 | | | | | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |