| 1) | Barton, Miguel | Lincoln (Mo.) | 47.10 (05/06-05/08) | 47.10 (05/06-05/08) | 47.27 (05/26-05/28) | 47.27 (05/26-05/28) | 47.69 (04/20-04/23) | 47.69 (04/20-04/23) | 48.24 (04/16) | 48.24 (04/16) |
| 2) | Reiser, Samuel | Penn State | 47.10 (05/13-05/15) | 47.10 (05/13-05/15) | 47.55 (05/13-05/15) | 47.55 (05/13-05/15) | 48.00 (05/06) | 48.00 (05/06) | 48.43 (03/25-03/26) | 48.43 (03/25-03/26) |