Stadium: Centre Court Round: 29 Ground: Hardcourt indoor
| Challenger St. Petersburg MD | 2021/03/11 11:00 | Sijsling/Smits v Kravchuk/Yevseyev | 2-6,4-6 |
| Challenger St. Petersburg MD | 2021/03/10 11:45 | Basic/Bourchier v Kravchuk/Yevseyev | 1-6,1-6 |
| Challenger St. Petersburg MD | 2021/03/12 09:35 | De Jong/Verbeek v Karlovskiy/Serdarusic | 6-2,7-6 |
| Challenger St. Petersburg MD | 2021/03/11 13:05 | Kopriva/Vrbensky v De Jong/Verbeek | 0-6,3-6 |
| Challenger St. Petersburg MD | 2021/03/10 14:30 | Golubev/Tiurnev v De Jong/Verbeek | 4-6,6-7 |
| Challenger St. Petersburg MD | 2021/03/06 13:45 | De Jong/Verbeek v Eubanks/Quiroz | 4-6,3-6 |
| Challenger St. Petersburg MD | 2021/03/05 13:45 | De Jong/Verbeek v Bega/Mansouri | 6-2,6-3 |
| Challenger St. Petersburg MD | 2021/03/04 12:45 | De Jong/Verbeek v Kotov/Safiullin | 6-2,6-2 |
| Challenger St. Petersburg MD | 2021/03/03 11:00 | De Jong/Verbeek v Kirkin/Molleker | 6-2,3-6,10-6 |