| 1) | Hutsalyuk, Pavlo | Iowa | 1:48.97 (02/20) | 1:50.07 (02/26-02/27) | 1:50.27 (02/26-02/27) | 1:50.88 (02/12-02/13) | 1:52.11 (02/05-02/06) | 1:52.77 (01/29-01/30) | 1:53.23 (01/23) | 1:55.05 (01/09) |
| 2) | Winebrenner, Cain | Missouri | 1:48.97 (02/26-02/27) | 1:51.87 (02/05-02/06) | 1:52.45 (02/12-02/13) | 1:54.40 (01/22-01/23) |