| 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 | Texas | 14 to 7 | 518 | 17 |
| 2 | 88 | 1.187 | (2,0) | 0.187 | Grambling | 70 to 0 | 318 | 226 |
| 3 | 54 | 1.609 | (3,0) | 0.609 | Ohio | 37 to 9 | 158 | 74 |
| 4 | 13 | 2.216 | (3,0) | 1.216 | --bye-- |
| 5 | 4 | 2.560 | (4,0) | 1.560 | Washington | 24 to 6 | 14 | 23 |
| 6 | 7 | 2.404 | (5,0) | 1.404 | Minnesota | 42 to 3 | 76 | 44 |
| 7 | 3 | 2.627 | (6,0) | 1.627 | Illinois | 34 to 16 | 17 | 19 |
| 8 | 3 | 2.466 | (7,0) | 1.466 | Wisconsin | 34 to 0 | 110 | 59 |
| 9 | 3 | 2.486 | (7,0) | 1.486 | --bye-- |
| 10 | 3 | 2.480 | (8,0) | 1.480 | Penn St | 38 to 14 | 98 | 41 |
| 11 | 2 | 2.464 | (9,0) | 1.464 | Purdue | 34 to 10 | 112 | 111 |
| 12 | 4 | 2.425 | (10,0) | 1.425 | UCLA | 48 to 10 | 85 | 84 |
| 13 | 2 | 2.401 | (11,0) | 1.401 | Rutgers | 42 to 9 | 79 | 75 |
| 14 | 1 | 2.446 | (12,0) | 1.446 | Michigan | 27 to 9 | 12 | 18 |
| 15 | 3 | 2.384 | (12,1) | 1.538 | Indiana | 10 to 13 | 1 | 1 |
| 16 | 2 | 2.389 | (12,1) | 1.543 | --bye-- |
| 17 | 3 | 2.401 | (12,1) | 1.554 | --bye-- |
| 18 | 3 | 2.429 | (12,1) | 1.583 | --bye-- |
| 19 | 4 | 2.343 | (12,2) | 1.628 | Miami FL | 14 to 24 | 7 | 7 |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |