Select tournament type
| 1/16-finals | Kostova E. | Rus A. | 0:2 (1:6, 0:6) | details | 27.07.2021 | ||
| 1/16-finals | Kostova E. | Cascino E. | 0:2 (4:6, 3:6) | details | 14.07.2021 | ||
| 1/8-finals | Kostova E. | Galfi D. | 0:2 (62:7, 1:6) | details | 08.07.2021 | ||
| 1/16-finals | Eikeri U. | Kostova E. | 1:2 (4:6, 6:3, 4:6) | details | 06.07.2021 | ||
| Semi-finals | Kostova E. | Wang Xin. | 0:2 (2:6, 1:6) | details | 24.06.2021 | ||
| Quarter-finals | Cascino E./Kostova E. | Selekhmeteva O./Vismane D. | 1:2 (4:6, 6:4, 4:10) | details | 14.07.2021 | ||
| Quarter-finals | Hesse A./Seguel D. | Fetecau I./Kostova E. | WO. | details | 08.07.2021 | ||
| 1/8-finals | Kempen M./Zuger J. | Fetecau I./Kostova E. | WO. | details | 07.07.2021 | ||
| Quarter-finals | Grey S. B./Kostova E. | Choi J. H./Han N. | 0:2 (1:6, 1:6) | details | 01.04.2021 | ||
| 1/8-finals | Raina A./Savinykh V. | Grey S. B./Kostova E. | 1:2 (6:4, 4:6, 10:12) | details | 31.03.2021 | ||