Derek Harrison has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2026 | Marathon | 4:39:48 | 33702 | |
| TCS London Marathon 2025 | Marathon | 4:50:08 | 33345 | |
| TCS London Marathon 2023 | Marathon | 4:09:17 | 21033 | |
| TCS London Marathon 2022 | Marathon | 4:24:21 | 18708 |