| 1) | Lee, William | MIT | 48.20 (05/02-05/04) | 48.42 (05/16-05/17) | 48.84 (04/13) | 48.90 (05/09-05/11) | 49.11 (04/27) | 49.38 (04/06) | |
| 2) | Linton, Stephan | Cortland St. | 48.20 (05/03-05/04) | 48.63 (04/28) | 48.76 (05/03-05/04) | 48.83 (05/16-05/17) | 49.81 (04/12-04/13) | 49.98 (04/05-04/06) | 50.26 (04/19-04/20) |