Gustav Jansen has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| BMW Berlin Marathon 2025 | Marathon | 3:11:28 | 3493 | |
| BMW Berlin Marathon 2024 | Marathon | 3:10:53 | 5952 | |
| BMW Berlin Marathon 2023 | Marathon | 3:17:11 | 5448 | |
| BMW Berlin Marathon 2022 | Marathon | 3:35:02 | 7333 |