| 1) | Johnson, Bailey | Oklahoma State | 1:00.32 (05/16-05/18) | 1:00.83 (05/02) | 1:01.16 (05/16-05/18) | 1:01.49 (04/18-04/19) | 1:02.27 (04/04-04/05) | 1:03.88 (03/21-03/22) | 1:03.92 (04/11-04/12) |
| 2) | Guster, Elexis | Iowa | 1:00.32 (04/12) | 1:01.00 (04/04-04/05) | 1:02.23 (03/28-03/29) |