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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 46.59 | March 10, 2017 | Nicolas Albiero | Cardinal Aquatics | Speedo Champions Series - Greensboro |
| 46.87 | Dec. 6, 2013 | Aaron Young | University of Louisville - Summer/Club | AT&T Winter National Championships |
| 49.14 | Nov. 14, 2013 | Pedro Oliveira | Cardinal Aquatics | Minnesota Grand Prix |
| 49.38 | Nov. 9, 2012 | Pedro Oliveira | Cardinal Aquatics | Minneapolis Grand Prix |
| 50.18 | March 21, 2008 | Seth Broster | Lexington Dolphins | NCSA Junior National Championships |
| 51.13 | Jan. 11, 2003 | Brandon Lovell | TEAM KENTUCKY | Mid-States Quadrangula |
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