Result History for Marissa Duffy
| Race Name | Race Date | Finish Time | Overall Place | Gender Place | Age | Age Group | Age Group Place |
| 2.4 Mile Non-Wetsuit | 2016-08-14 | 01:02:14 | 6/46 | 4/29 | 13 | 10 - 19 | 2/6 |
| 1.2 Mile Non-Wetsuit | 2015-08-23 | 29:12:00 | 9/42 | 5/27 | 13 | 10 - 19 | 3/6 |
| 1000 Yard | 2013-08-18 | 00:12:56 | 5/9 | 2/3 | 10 | 10 - 19 | 2/3 |