Sean Mancillas has 3 recorded races from Oceanside, California, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-08-16 | America's Finest City Half Marathon & 5K | Half Marathon | 2:13:36 | 1252 |
| 2026-03-22 | GOVX San Diego Half Marathon & 5K | Half Marathon | 2:05:07 | 1175 |
| 2026-01-18 | Carlsbad Marathon, Half Marathon & 5K | Half Marathon | 2:21:39 | 2523 |