Koji Miyazaki has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2026 | Marathon | 3:35:53 | 11522 | |
| TCS London Marathon 2025 | Marathon | 3:22:40 | 6917 | |
| TCS London Marathon 2024 | Marathon | 3:20:47 | 7531 | |
| TCS London Marathon 2023 | Marathon | 3:18:05 | 5884 |