Syl Den Boer has 3 recorded races from Chesapeake, Virginia, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-03-21 | 2026 Yuengling Shamrock Marathon Weekend Final Mile | 1 Mile | 06:18 | 47 |
| 2025-03-15 | 2025 Yuengling Shamrock Marathon Weekend Final Mile | 1 Mile | 06:46 | 91 |
| 2024-03-16 | 2024 Yuengling Shamrock Marathon Weekend Final Mile | 1 Mile | 08:36 | 838 |