William Gjertsen Tønnesen has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| BMW Berlin Marathon 2025 | Marathon | 4:58:41 | 24635 | |
| BMW Berlin Marathon 2024 | Marathon | 3:34:33 | 12194 | |
| BMW Berlin Marathon 2023 | Marathon | 3:51:41 | 13278 | |
| BMW Berlin Marathon 2022 | Marathon | 4:55:12 | 19718 |