Darya Kustova defeated Margalita Chakhnashvili 7-5 7-5 in the Balashikha 25K round of 16 on clay. The upset overturned the form book — Margalita Chakhnashvili came in leading the head-to-head 4–1. Darya Kustova narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-04-18 | Civitavecchia 25K | R16 | clay | Margalita Chakhnashvili | 6-2 1-6 7-5 |
| 2009-04-13 | Civitavecchia 25K | R16 | clay | Darya Kustova | 6-2 4-6 6-1 |
| 2007-06-25 | Padova 25K | R16 | clay | Margalita Chakhnashvili | 4-6 6-1 7-5 |
| 2006-07-31 | Martina Franca 50K | QF | clay | Margalita Chakhnashvili | 6-2 4-6 6-2 |
| 2005-08-22 | Moscow 25K | R32 | clay | Margalita Chakhnashvili | 2-6 7-5 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.