 USA: US Open - Doubles - Main |
|---|
| 1/16-finals | Costoulas S./Hietaranta L. | Garcia J./Mutavdzic M. | 0:2 (2:6, 4:6) | details | 06.09.2021 |
 United Kingdom: Wimbledon - Doubles - Main |
|---|
| Final | Dmitruk K./Shnaider D. | Costoulas S./Hietaranta L. | 2:0 (6:1, 6:2) | details | 11.07.2021 |
| Semi-finals | Costoulas S./Hietaranta L. | Fruhvirtova L./Kudermetova P. | 2:1 (2:6, 6:2, 10:8) | details | 10.07.2021 |
| Quarter-finals | Costoulas S./Hietaranta L. | Fontenel C./Krueger A. | 2:1 (5:7, 6:3, 10:6) | details | 09.07.2021 |
| 1/8-finals | Costoulas S./Hietaranta L. | Shcherbinina A./Zeynalova S. | 2:0 (6:4, 6:0) | details | 08.07.2021 |
| 1/16-finals | Garcia J./Guzman D. | Costoulas S./Hietaranta L. | 1:2 (1:6, 6:3, 6:10) | details | 07.07.2021 |
 France: French Open - Doubles - Main |
|---|
| 1/8-finals | Eala A./Selekhmeteva O. | Costoulas S./Hietaranta L. | 2:0 (6:3, 6:1) | details | 08.06.2021 |
| 1/16-finals | Maklakova E./Sholokhova M. | Costoulas S./Hietaranta L. | 0:2 (5:7, 3:6) | details | 07.06.2021 |
