1) | Viney, Cam | Illinois | 50.66 (04/23) | 50.67 (05/13-05/15) | 50.96 (04/01-04/02) | 51.08 (05/13-05/15) | 51.19 (03/18-03/19) |
2) | Mowatt, Kemar | Arkansas | 50.66 (03/30-04/02) | 50.68 (05/12-05/14) | 51.14 (05/12-05/14) | 51.36 (04/22-04/23) | 51.38 (03/30-04/02) |