| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 1 | 40 | 0.000 | (0,0) | 0.000 | --bye-- |
| 2 | 29 | 0.500 | (1,0) | -0.500 | East Carolina | 30 to 3 | 424 | 214 |
| 3 | 119 | 3.174 | (2,0) | 2.174 | UNLV | 35 to 7 | 177 | 47 |
| 4 | 17 | 2.517 | (3,0) | 1.517 | Bowling Green | 31 to 6 | 94 | 94 |
| 5 | 6 | 2.665 | (4,0) | 1.665 | Rutgers | 31 to 7 | 22 | 44 |
| 6 | 4 | 2.546 | (5,0) | 1.546 | Nebraska | 45 to 7 | 85 | 81 |
| 7 | 6 | 2.489 | (6,0) | 1.489 | Minnesota | 52 to 10 | 52 | 61 |
| 8 | 8 | 2.369 | (7,0) | 1.369 | Indiana | 52 to 7 | 127 | 125 |
| 9 | 6 | 2.332 | (8,0) | 1.332 | Michigan St | 49 to 0 | 98 | 72 |
| 10 | 5 | 2.382 | (8,0) | 1.382 | --bye-- |
| 11 | 6 | 2.390 | (9,0) | 1.390 | Purdue | 41 to 13 | 95 | 83 |
| 12 | 3 | 2.475 | (10,0) | 1.475 | Penn State | 24 to 15 | 11 | 11 |
| 13 | 4 | 2.433 | (11,0) | 1.433 | Maryland | 31 to 24 | 46 | 36 |
| 14 | 2 | 2.542 | (12,0) | 1.542 | Ohio State | 30 to 24 | 5 | 7 |
| 15 | 2 | 2.500 | (13,0) | 1.500 | Iowa | 26 to 0 | 13 | 16 |
| 16 | 2 | 2.496 | (13,0) | 1.496 | --bye-- |
| 17 | 2 | 2.476 | (13,0) | 1.476 | --bye-- |
| 18 | 2 | 2.531 | (14,0) | 1.531 | Alabama | 27 to 20 | 5 | 5 |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |