S. Sierra and L. Boisson are level 1-1 in their head-to-head since 2018 over 2 matches.
| Surface | S. Sierra | L. Boisson |
|---|---|---|
| Grass | 1 | 0 |
| Clay | 0 | 1 |
| Date | Winner | Score | Event |
|---|---|---|---|
| June 10, 2026 | S. Sierra | 2 - 1 | Hertogenbosch · 1/16-finals · grass |
| May 2, 2024 | L. Boisson | 2 - 0 | Saint Malo Challenger Women · 1/8-finals · clay |