S. Costoulas leads the all-time head-to-head 3-2 against A. Aksu, over 5 matches.
| Surface | A. Aksu | S. Costoulas |
|---|---|---|
| Clay | 1 | 3 |
| Other | 1 | 0 |
| Date | Winner | Score | Event |
|---|---|---|---|
| July 20, 2026 | A. Aksu | 2 - 1 | Livesport Prague Open · 1/16-finals · clay |
| July 19, 2026 | S. Costoulas | 2 - 0 | Livesport Prague Open · Final · clay |
| April 28, 2026 | S. Costoulas | 2 - 0 | Saint Malo · 1/16-finals · clay |
| Nov. 15, 2025 | A. Aksu | 0 - 2 | WTA Billie Jean King Cup - World Group |
| Aug. 30, 2025 | S. Costoulas | 1 - 2 | W35 Heraklion · Semi-finals · clay |