Marina Lazic defeated Natalija Kostic 6-4 1-6 6-3 in the Belgrade 10K round of 16 on clay. The result followed the form book — Marina Lazic came in leading the head-to-head 2–0. Marina Lazic extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-09-09 | Vrnjacka Banja 10K | R32 | clay | Marina Lazic | 6-3 6-7(4) 6-4 |
| 2012-06-25 | Prokuplje 10K | R16 | clay | Marina Lazic | 6-2 4-6 6-3 |