| 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 | Indiana | 23 to 3 | 424 | 125 |
| 3 | 88 | 3.594 | (2,0) | 2.594 | Youngstown St | 35 to 7 | 144 | 115 |
| 4 | 9 | 2.674 | (3,0) | 1.674 | Western Kentucky | 63 to 10 | 53 | 80 |
| 5 | 8 | 2.585 | (4,0) | 1.585 | Notre Dame | 17 to 14 | 23 | 15 |
| 6 | 6 | 2.481 | (4,0) | 1.481 | --bye-- |
| 7 | 2 | 2.612 | (5,0) | 1.612 | Maryland | 37 to 17 | 32 | 36 |
| 8 | 4 | 2.488 | (6,0) | 1.488 | Purdue | 41 to 7 | 76 | 83 |
| 9 | 1 | 2.544 | (7,0) | 1.544 | Penn State | 20 to 12 | 13 | 11 |
| 10 | 1 | 2.587 | (8,0) | 1.587 | Wisconsin | 24 to 10 | 31 | 53 |
| 11 | 1 | 2.605 | (9,0) | 1.605 | Rutgers | 35 to 16 | 36 | 44 |
| 12 | 2 | 2.542 | (10,0) | 1.542 | Michigan St | 38 to 3 | 78 | 72 |
| 13 | 2 | 2.510 | (11,0) | 1.510 | Minnesota | 37 to 3 | 58 | 61 |
| 14 | 5 | 2.473 | (11,1) | 1.639 | Michigan | 24 to 30 | 2 | 2 |
| 15 | 5 | 2.386 | (11,1) | 1.553 | --bye-- |
| 16 | 5 | 2.382 | (11,1) | 1.548 | --bye-- |
| 17 | 5 | 2.361 | (11,1) | 1.528 | --bye-- |
| 18 | 7 | 2.301 | (11,2) | 1.608 | Missouri | 3 to 14 | 8 | 8 |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |