Marshall Nelson has 3 recorded races from Chicago, Illinois, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-08-23 | 2025 Chicago Triathlon Olympic | Ultra Marathon | 2:46:15 | 476 |
| 2024-08-24 | 2024 Chicago Triathlon International | Ultra Marathon | 2:46:43 | 417 |
| 2023-08-27 | 2023 Chicago Triathlon International | Ultra Marathon | 2:16:04 | 546 |