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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 49.88 | Feb. 22, 2024 | Cael Dice | Nebraska Wesleyan University | American Rivers Championship |
| 50.25 | Feb. 17, 2023 | Zach Kolker | Coe College | American Rivers Conference Championship |
| 50.53 | Feb. 11, 2022 | Cael Dice | Nebraska Wesleyan University | American Rivers Conference Invitational |
| 51.00 | Dec. 3, 2021 | Cael Dice | Nebraska Wesleyan University | Pioneer Classic |
| 51.95 | Nov. 12, 2021 | Cael Dice | Nebraska Wesleyan University | Coe vs. NWU |
| 52.53 | Nov. 5, 2021 | Cael Dice | Nebraska Wesleyan University | NWU vs. Loras |
| 53.11 | Oct. 22, 2021 | Cael Dice | Nebraska Wesleyan University | Luther vs. NWU |
| 54.31 | Oct. 2, 2021 | Cael Dice | Nebraska Wesleyan University | Nebraska Wesleyan vs. Omaha |
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