Brian Underwood has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2026 | Marathon | 2:35:32 | 410 | |
| TCS London Marathon 2024 | Marathon | 2:29:53 | 178 | |
| TCS London Marathon 2023 | Marathon | 2:30:05 | 129 | |
| TCS London Marathon 2022 | Marathon | 2:38:26 | 272 |