Kirsten Flipkens defeated Donna Vekic 6-4 5-7 7-5 in the St. Petersburg qualifying final on hard. The result followed the form book — Kirsten Flipkens came in leading the head-to-head 4–0. Kirsten Flipkens extended the head-to-head to 5–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-01-01 | Auckland | R32 | hard | Kirsten Flipkens | 7-6(5) 3-6 6-4 |
| 2016-04-18 | Istanbul | R32 | clay | Kirsten Flipkens | 7-6(5) 6-4 |
| 2016-04-04 | Katowice | R32 | hard | Kirsten Flipkens | 6-1 6-4 |
| 2013-10-07 | Linz | R32 | hard | Kirsten Flipkens | 2-6 6-2 6-2 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.