Stadium: Italcementi Round: 26 Ground: Hardcourt indoor
| ITF M25 Grodzisk Mazowiecki MD | 2021/08/08 12:15 | Hermans/Matuszewski v Klier Junior/Sakamoto | 6-4,7-5 |
| ITF M25 Grodzisk Mazowiecki MD | 2021/08/07 12:45 | Hermans/Matuszewski v Beloborodko/Peliwo | 5-7,7-5,10-4 |
| ITF M25 Grodzisk Mazowiecki MD | 2021/08/03 13:45 | Hermans/Matuszewski v Galus/Grynkowski | 6-3,6-3 |