Rex Dalmacio has 3 recorded races from Cupang, Antipolo City, RIZ, PHL.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-11-29 | 2025 Rock 'n' Roll Manila Half Marathon | Half Marathon | 3:40:32 | 2256 |
| 2024-11-24 | 2024 Rock 'n' Roll Manila Half Marathon | Half Marathon | 3:21:43 | 2209 |
| 2023-11-26 | 2023 Rock 'n' Roll Manila Half Marathon | Half Marathon | 3:19:45 | 2184 |