Heydon Mizon has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2025 | Marathon | 2:47:51 | 1277 | |
| TCS London Marathon 2024 | Marathon | 2:42:50 | 983 | |
| TCS London Marathon 2023 | Marathon | 2:41:52 | 726 | |
| TCS London Marathon 2022 | Marathon | 2:43:35 | 469 |