David Duffin has 5 recorded races from Santa Clara, CA, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-02-22 | 2026 Rock 'n' Roll Las Vegas Half Marathon | Half Marathon | 2:11:32 | 3707 |
| 2025-10-05 | 2025 Rock 'n' Roll San Jose Half Marathon | Half Marathon | 2:11:22 | 2159 |
| 2024-10-06 | 2024 Rock 'n' Roll San Jose Half Marathon | Half Marathon | 2:17:46 | 2286 |
| 2023-09-30 | 2023 Rock 'n' Roll San Jose Half Marathon | Half Marathon | 2:15:24 | 2805 |
| 2022-10-09 | 2022 Rock 'n' Roll San Jose Half Marathon | Half Marathon | 2:06:12 | 1620 |