St. Petersburg 2 CH 2021 ATP
Final
| Winner | Loser | Score | |
|---|---|---|---|
| Evgenii Tiurnev | d. | Kacper Zuk | 6-4 6-2 |
Semifinals
| Winner | Loser | Score | |
|---|---|---|---|
| Kacper Zuk | d. | Jiri Lehecka | 7-6(7) 6-3 |
| Evgenii Tiurnev | d. | Marius Copil | 7-6(4) 6-2 |
Quarterfinals
| Winner | Loser | Score | |
|---|---|---|---|
| Jiri Lehecka | d. | Dmitry Popko | 6-4 6-4 |
| Kacper Zuk | d. | Jack Sock | 6-3 6-2 |
| Marius Copil | d. | Christopher Eubanks | 7-6(1) 7-5 |
| Evgenii Tiurnev | d. | Mirza Basic | 6-4 6-2 |
Round of 16
| Winner | Loser | Score | |
|---|---|---|---|
| Dmitry Popko | d. | Denis Yevseyev | 6-4 2-6 6-4 |
| Jiri Lehecka | d. | Rudolf Molleker | 6-2 6-3 |
| Jack Sock | d. | Pavel Kotov | 6-4 6-3 |
| Kacper Zuk | d. | Zizou Bergs | 1-6 6-4 6-3 |
| Christopher Eubanks | d. | Duje Ajdukovic | 6-3 6-3 |
| Marius Copil | d. | Alexey Vatutin | 5-7 6-3 6-1 |
| Evgenii Tiurnev | d. | Altug Celikbilek | 6-3 2-6 6-3 |
| Mirza Basic | d. | Roberto Ortega Olmedo | 6-1 7-6(3) |
Round of 32
| Winner | Loser | Score | |
|---|---|---|---|
| Dmitry Popko | d. | Nino Serdarusic | 6-4 6-4 |
| Denis Yevseyev | d. | Vaja Uzakov | 6-0 6-0 |
| Jiri Lehecka | d. | Matija Pecotic | 6-2 7-6(4) |
| Rudolf Molleker | d. | Evgeny Karlovskiy | 6-3 7-5 |
| Jack Sock | d. | Cem Ilkel | 5-7 6-4 6-4 |
| Pavel Kotov | d. | Tim Van Rijthoven | 6-2 6-4 |
| Zizou Bergs | d. | Pedja Krstin | 6-2 6-1 |
| Kacper Zuk | d. | Igor Sijsling | 6-4 6-3 |
| Christopher Eubanks | d. | Jesper De Jong | 7-5 6-4 |
| Duje Ajdukovic | d. | Shuichi Sekiguchi | 7-5 6-2 |
| Alexey Vatutin | d. | Duck Hee Lee | 0-6 6-1 6-1 |
| Marius Copil | d. | Michael Vrbensky | 6-3 6-1 |
| Altug Celikbilek | d. | Teymuraz Gabashvili | 6-2 6-2 |
| Evgenii Tiurnev | d. | Vit Kopriva | 6-4 6-2 |
| Roberto Ortega Olmedo | d. | Roberto Quiroz | 6-3 6-3 |
| Mirza Basic | d. | Roman Safiullin | 6-4 7-6(7) |
Qualifying round 2
| Winner | Loser | Score | |
|---|---|---|---|
| Jiri Lehecka | d. | Jelle Sels | 6-4 6-3 |
| Tim Van Rijthoven | d. | Khumoun Sultanov | 6-2 6-1 |
| Matija Pecotic | d. | Alessandro Bega | 6-3 6-3 |
| Mirza Basic | d. | Aleksandr Nedovyesov | 6-4 6-2 |
Qualifying round 1
| Winner | Loser | Score | |
|---|---|---|---|
| Jelle Sels | d. | Andrey Kuznetsov | 6-4 6-3 |
| Jiri Lehecka | d. | Ivan Nedelko | 6-1 6-3 |
| Tim Van Rijthoven | d. | Konstantin Kravchuk | 6-4 6-4 |
| Khumoun Sultanov | d. | Daniil Glinka | 7-6(4) 6-4 |
| Matija Pecotic | d. | Uladzimir Ignatik | 0-6 7-6(3) 6-4 |
| Alessandro Bega | d. | Harry Bourchier | 6-2 6-3 |
| Aleksandr Nedovyesov | d. | Daniil Golubev | 6-1 6-0 |
| Mirza Basic | d. | Viktor Durasovic | 7-5 6-4 |