Constance Sibille defeated Elitsa Kostova 6-3 6-2 in the Equeurdreville 10K semi-final on hard. The upset overturned the form book — Elitsa Kostova came in leading the head-to-head 4–0. Constance Sibille claimed a first win over Elitsa Kostova in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-10 | Joue Les Tours 50K | R32 | hard | Elitsa Kostova | 6-7(3) 6-4 6-4 |
| 2010-02-15 | Albufeira 1 10K | QF | hard | Elitsa Kostova | 7-6(6) 6-3 |
| 2010-02-15 | Albufeira 2 10K | QF | hard | Elitsa Kostova | 7-6(6) 6-3 |
| 2007-09-17 | Limoges 10K | R16 | hard | Elitsa Kostova | 6-4 6-2 |
Averages over each player's completed matches in the selected window (4 vs 96). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About