Elitsa Kostova defeated Cagla Buyukakcay 6-4 6-3 in the Vinaros 10K quarter-final on clay. The upset overturned the form book — Cagla Buyukakcay came in leading the head-to-head 3–2. Elitsa Kostova narrowed the head-to-head to 3–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-09-07 | W60+H Zagreb | QF | clay | Cagla Buyukakcay | 6-2 6-4 |
| 2016-05-18 | Roland Garros | Q128 | clay | Cagla Buyukakcay | 6-4 6-0 |
| 2014-02-06 | Fed Cup G1 RR: BUL vs TUR | RR | hard | Cagla Buyukakcay | 7-6 6-1 |
| 2008-11-24 | Vallduxo 10K | QF | clay | Elitsa Kostova | 3-6 6-4 7-5 |
| 2008-04-14 | AntalyaBelek 10K | SF | clay | Elitsa Kostova | 6-1 6-0 |
Averages over each player's completed matches in the selected window (96 vs 195). 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