Stephen Duff has 2 recorded races from Saint Peters, Missouri, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-10-05 | MO' Cowbell Marathon/Half-Marathon/10K/5K Half Marathon | Half Marathon | 2:01:06 | 662 |
| 2022-10-02 | MO' Cowbell Marathon/Half-Marathon/10K/5K Half Marathon | Half Marathon | 2:23:26 | 1159 |