| 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 | 169 |
| 2 | 6 | 3.600 | (2,0) | 2.600 | S Illinois | 34 to 17 | 22 | 142 |
| 3 | 84 | 1.357 | (2,1) | 1.023 | USC | 17 to 33 | 29 | 14 |
| 4 | 92 | 1.247 | (2,2) | 1.247 | Notre Dame | 30 to 56 | 35 | 9 |
| 5 | 92 | 1.287 | (2,2) | 1.287 | --bye-- |
| 6 | 65 | 1.467 | (2,3) | 1.667 | Illinois | 27 to 43 | 10 | 19 |
| 7 | 91 | 1.304 | (2,4) | 1.637 | Minnesota | 20 to 27 | 56 | 44 |
| 8 | 93 | 1.189 | (2,5) | 1.617 | Northwestern | 0 to 19 | 42 | 48 |
| 9 | 127 | 0.981 | (2,6) | 1.481 | Rutgers | 24 to 27 | 84 | 75 |
| 10 | 121 | 0.997 | (2,7) | 1.553 | Michigan | 16 to 21 | 14 | 18 |
| 11 | 112 | 1.087 | (2,8) | 1.687 | Ohio St | 10 to 34 | 2 | 4 |
| 12 | 120 | 1.062 | (2,9) | 1.699 | Washington | 13 to 49 | 25 | 23 |
| 13 | 120 | 1.030 | (2,9) | 1.667 | --bye-- |
| 14 | 118 | 1.046 | (2,10) | 1.713 | Indiana | 3 to 56 | 2 | 1 |
| 15 | 112 | 1.059 | (2,10) | 1.726 | --bye-- |
| 16 | 110 | 1.067 | (2,10) | 1.733 | --bye-- |
| 17 | 112 | 1.080 | (2,10) | 1.747 | --bye-- |
| 18 | 108 | 1.100 | (2,10) | 1.767 | --bye-- |
| 19 | 111 | 1.083 | (2,10) | 1.750 | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |