| | | | |
|  Canada |  South Korea | |
|
|
RANK 132 | Gabriel Diallo | 6-4 6-4 | Soonwoo Kwon | RANK 700 |
RANK 486 | Vasek Pospisil | 6-4 6-3 | Seong Chan Hong | RANK 224 |
| Andrea Grossi / Vasek Pospisil | 4-6 7-6(4) 3-6 | Ji Sung Nam / Min-Kyu Song | |
RANK 132 | Gabriel Diallo | 7-5 4-6 6-1 | Seong Chan Hong | RANK 224 |
RANK 486 | Vasek Pospisil | NOT PLAYED | Soonwoo Kwon | RANK 700 |
| | | | |
| | | | |
|  Serbia |  Slovakia | |
|
|
RANK 41 | Miomir Kecmanovic | 6-7(2) 2-6 | Lukas Klein | RANK 142 |
RANK 53 | Dusan Lajovic | 6-4 2-6 0-6 | Alex Molcan | RANK 122 |
| Nikola Cacic / David Korsten | 6-7(4) 3-6 | Beka Komakhidze / | |
RANK 34 | Laslo Djere | 3-4 RET | Lukas Pokorny | RANK 589 |
RANK 53 | Dusan Lajovic | NOT PLAYED | Lukas Klein | RANK 142 |
| | | | |
| | | | |
|  Croatia |  Belgium | |
|
|
RANK 1044 | Marin Cilic | 4-6 6-4 4-6 | Zizou Bergs | RANK 131 |
RANK 125 | Duje Ajdukovic | 6-1 6-4 | Joris De Loore | RANK 192 |
| Ivan Dodig / Mate Pavic | 6-2 3-6 6-7(4) | Sander Gille / Joran Vliegen | |
RANK 125 | Duje Ajdukovic | 1-6 5-7 | Zizou Bergs | RANK 131 |
RANK 1044 | Marin Cilic | NOT PLAYED | Joris De Loore | RANK 192 |
| | | | |
| | | | |
|  Hungary |  Germany | |
|
|
RANK 57 | Fabian Marozsan | 2-6 6-7(4) | Dominik Koepfer | RANK 60 |
RANK 82 | Marton Fucsovics | 6-3 7-5 | Jan-Lennard Struff | RANK 24 |
| Sasha Merzetti / Petr Vodak | 3-6 6-7(3) | Kevin Krawietz / Tim Puetz | |
RANK 213 | Mate Valkusz | 3-6 2-6 | Jan-Lennard Struff | RANK 24 |
RANK 129 | Zsombor Piros | 7-6(2) 6-3 | Kevin Krawietz | RANK |
| | | | |
| | | | |
|  Netherlands |  Switzerland | |
|
|
RANK 29 | Tallon Griekspoor | 7-6(3) 7-6(3) | Marc-Andrea Huesler | RANK 199 |
RANK 63 | Botic Van De Zandschulp | 4-6 6-7(3) | Leandro Riedi | RANK 175 |
| Wesley Koolhof / | 6-7(5) 6-7(2) | Tomas Hrabec / Tomas Roldan | |
RANK 29 | Tallon Griekspoor | 7-6(6) 7-6(3) | Leandro Riedi | RANK 175 |
RANK 63 | Botic Van De Zandschulp | 5-7 7-6(5) 6-3 | Marc-Andrea Huesler | RANK 199 |
| | | | |
| | | | |
|  Czech Republic |  Israel | |
|
|
RANK 127 | Jakub Mensik | 6-1 7-6(4) | Yshai Oliel | RANK 415 |
RANK 31 | Jiri Lehecka | 6-1 7-6(2) | Daniel Cukierman | RANK 465 |
| Mackenzie McDonald / Adam Pavlasek | 4-1 | Gabriel Oliveira Camargo / Edan Leshem | |
RANK 115 | Vit Kopriva | 3-6 6-3 11-9 | Orel Kimhi | RANK 456 |
RANK 127 | Jakub Mensik | NOT PLAYED | Daniel Cukierman | RANK 465 |
| | | | |
| | | | |
|  Ukraine |  United States | |
|
|
RANK 342 | Oleksii Krutykh | 3-6 7-6(3) 4-6 | Sebastian Korda | RANK 33 |
RANK 498 | Viacheslav Bielinskyi | 3-6 2-6 | Christopher Eubanks | RANK 32 |
| Lewis Bumgardner / Vladimir Korolev | 3-6 6-4 3-6 | Austin Krajicek / Rajeev Ram | |
RANK 598 | Vladyslav Orlov | 3-6 4-6 | Taylor Fritz | RANK 9 |
RANK 498 | Viacheslav Bielinskyi | NOT PLAYED | Sebastian Korda | RANK 33 |
| | | | |
| | | | |
|  Finland |  Portugal | |
|
|
RANK 166 | Otto Virtanen | 6-2 6-1 | Nuno Borges | RANK 47 |
RANK 55 | Emil Ruusuvuori | 6-2 6-3 | Joao Sousa | RANK 245 |
| Harri Heliovaara / Rafael Racy | 6-4 7-6(6) | Damien Bayard / | |
RANK 1005 | Eero Vasa | 4-6 5-7 | Henrique Rocha | RANK 243 |
| | | | |
| | | | |
|  Chinese Taipei |  France | |
|
|
RANK 230 | Yu Hsiou Hsu | 4-6 4-6 | Luca Van Assche | RANK 68 |
RANK 238 | Tung-Lin Wu | 3-6 5-7 | Adrian Mannarino | RANK 17 |
| Yu Hsiou Hsu / Jason Jung | 6-3 2-6 6-7(1) | Nicolas Mahut / Edouard Roger-Vasselin | |
RANK 305 | Chun-Hsin Tseng | 3-6 6-7(3) | Quentin Halys | RANK 100 |
RANK 238 | Tung-Lin Wu | NOT PLAYED | Luca Van Assche | RANK 68 |
| | | | |
| | | | |
|  Argentina |  Kazakhstan | |
|
|
RANK 22 | Francisco Cerundolo | 7-5 6-2 | Dmitry Popko | RANK 338 |
RANK 28 | Tomas Martin Etcheverry | 4-6 5-7 | Timofei Skatov | RANK 278 |
| Maximo Gonzalez / Andres Molteni | 6-7(3) 6-4 6-0 | Aleksandr Nedovyesov / Dmitry Popko | |
RANK 22 | Francisco Cerundolo | 6-7(1) 4-6 | Timofei Skatov | RANK 278 |
RANK 25 | Sebastian Baez | 6-4 3-6 7-6(6) | Dmitry Popko | RANK 338 |
| | | | |
| | | | |
|  Sweden |  Brazil | |
|
|
RANK 364 | Karl Friberg | 3-6 6-7(5) | Thiago Monteiro | RANK 119 |
RANK 160 | Elias Ymer | 4-6 6-1 6-3 | Gustavo Heide | RANK 241 |
| Filip Bergevi / Andre Goransson | 2-6 5-7 | / Jose De Armas | |
RANK 160 | Elias Ymer | 6-4 4-6 2-6 | Thiago Monteiro | RANK 119 |
RANK 364 | Karl Friberg | NOT PLAYED | Gustavo Heide | RANK 241 |
| | | | |
| | | | |
|  Chile |  Peru | |
|
|
RANK 54 | Bjorn Thomson | 4-6 6-2 6-1 | Arakel Vartanyan | RANK 87 |
RANK 87 | Arakel Vartanyan | NOT PLAYED | Nicolas Jarry | RANK 20 |
| / | NOT PLAYED | / | |
RANK 54 | Alejandro Tabilo | NOT PLAYED | Arklon Huertas Del Pino | RANK 587 |
| | | | |