S. Sierra leads the head-to-head 2-0 since 2018 against A. Bondar, over 2 matches.
| Surface | S. Sierra | A. Bondar |
|---|---|---|
| Grass | 1 | 0 |
| Clay | 1 | 0 |
| Date | Winner | Score | Event |
|---|---|---|---|
| June 29, 2026 | S. Sierra | 2 - 1 | Wimbledon · 1/64-finals · grass |
| April 4, 2025 | S. Sierra | 2 - 0 | Antalya 3 · Quarter-finals · clay |