| | | | |
| Bosnia and Herzegovina | Germany | |
|
|
RANK 241 | Nerman Fatic | 6-7(5) 2-6 | Daniel Altmaier | RANK 91 |
RANK 197 | Damir Dzumhur | 2-6 1-6 | Yannick Hanfmann | RANK 133 |
| Mirza Basic / Damir Dzumhur | 4-6 2-6 | Kevin Krawietz / Tim Puetz | |
RANK 1227 | Andrej Nedic | 1-6 6-7(4) | Maximilian Marterer | RANK 157 |
RANK 241 | Nerman Fatic | NOT PLAYED | Yannick Hanfmann | RANK 133 |
| | | | |
| | | | |
| Bulgaria | Kazakhstan | |
|
|
RANK 192 | Dimitar Kuzmanov | | Timofei Skatov | RANK 129 |
RANK 192 | Dimitar Kuzmanov | 4-6 6-7(4) | Alexander Bublik | RANK 36 |
| Alexander Donski / Alexandar Lazarov | 6-3 6-3 | Alexander Bublik / Aleksandr Nedovyesov | |
| | | | |
| | | | |
| Belgium | Uzbekistan | |
|
|
RANK 215 | Kimmer Coppejans | 6-7(8) 6-3 6-7(6) | Khumoyun Sultanov | RANK 480 |
RANK 211 | Joris De Loore | 7-5 7-6(2) | Sergey Fomin | RANK 366 |
| Sander Gille / Joran Vliegen | 6-1 3-6 6-2 | Sergey Fomin / Maxim Shin | |
RANK 211 | Joris De Loore | 6-3 6-4 | Khumoyun Sultanov | RANK 480 |
RANK 215 | Kimmer Coppejans | NOT PLAYED | Sergey Fomin | RANK 366 |
| | | | |
| | | | |
| Argentina | Lithuania | |
|
|
RANK 31 | Francisco Cerundolo | 6-1 6-7(6) 6-2 | Vilius Gaubas | RANK 760 |
RANK 47 | Sebastian Baez | 7-6(6) 5-7 6-3 | Ricardas Berankis | RANK 193 |
| Maximo Gonzalez / Andres Molteni | 6-4 6-3 | Tadas Babelis / Edas Butvilas | |
RANK 82 | Tomas Martin Etcheverry | 6-2 6-4 | Edas Butvilas | RANK 784 |
RANK 47 | Sebastian Baez | NOT PLAYED | Vilius Gaubas | RANK 760 |
| | | | |
| | | | |
| Ukraine | Colombia | |
|
|
RANK 176 | Oleksii Krutykh | 6-4 6-3 | Nicolas Mejia | RANK 253 |
RANK 385 | Vladyslav Orlov | 7-5 3-6 0-6 | Daniel Elahi Galan | RANK 81 |
| Illya Beloborodko / Viacheslav Bielinskyi | 2-6 4-6 | Juan-Sebastian Cabal / Robert Farah | |
RANK 176 | Oleksii Krutykh | 3-6 6-0 6-3 | Daniel Elahi Galan | RANK 81 |
RANK 385 | Vladyslav Orlov | 5-7 6-4 7-6(4) | Nicolas Mejia | RANK 253 |
| | | | |
| | | | |
| Hungary | Turkey | |
|
|
RANK 161 | Fabian Marozsan | 7-5 6-2 | Altug Celikbilek | RANK 205 |
RANK 182 | Zsombor Piros | 6-2 6-3 | Cem Ilkel | RANK 304 |
| Fabian Marozsan / Mate Valkusz | 6-3 6-3 | Altug Celikbilek / Cem Ilkel | |
RANK 182 | Zsombor Piros | NOT PLAYED | Altug Celikbilek | RANK 205 |
| | | | |
| | | | |
| Israel | Japan | |
|
|
RANK 476 | Yshai Oliel | 4-6 6-7(5) | Sho Shimabukuro | RANK 234 |
RANK 367 | Daniel Cukierman | 1-6 7-6(5) 6-2 | Shintaro Mochizuki | RANK 311 |
| Daniel Cukierman / Edan Leshem | 2-6 6-7(2) | Ben McLachlan / Kaito Uesugi | |
RANK 367 | Daniel Cukierman | 2-6 6-1 7-6(4) | Sho Shimabukuro | RANK 234 |
RANK 476 | Yshai Oliel | 2-6 7-5 6-0 | Shintaro Mochizuki | RANK 311 |
| | | | |
| | | | |
| Austria | Portugal | |
|
|
RANK 125 | Jurij Rodionov | 6-7(4) 6-3 3-6 | Nuno Borges | RANK 105 |
RANK 151 | Sebastian Ofner | 7-5 3-6 6-7(1) | Joao Sousa | RANK 84 |
| Alexander Erler / Lucas Miedler | 7-6(0) 7-6(5) | Nuno Borges / Francisco Cabral | |
RANK 144 | Dennis Novak | 3-6 2-6 | Nuno Borges | RANK 105 |
RANK 125 | Jurij Rodionov | NOT PLAYED | Joao Sousa | RANK 84 |
| | | | |
| | | | |
| Greece | Slovakia | |
|
|
RANK 954 | Alexandros Skorilas | 1-6 1-6 | Alex Molcan | RANK 55 |
RANK 3 | Stefanos Tsitsipas | 6-7(3) 7-6(5) 4-0 RET | Lukas Klein | RANK 143 |
| Petros Tsitsipas / Stefanos Tsitsipas | 3-6 7-6(5) 3-6 | Lukas Klein / Igor Zelenay | |
RANK 3 | Stefanos Tsitsipas | 6-7(6) 6-4 3-6 | Alex Molcan | RANK 55 |
RANK 954 | Alexandros Skorilas | NOT PLAYED | Lukas Klein | RANK 143 |
| | | | |
| | | | |
| Peru | Norway | |
|
|
RANK 544 | Gonzalo Bueno | 3-6 4-6 | Viktor Durasovic | RANK 362 |
RANK 94 | Juan Pablo Varillas | 6-1 6-1 | Viktor Durasovic | RANK 362 |
| Viktor Durasovic / Herman Hoeyeraal | 4-6 2-6 | Arklon Huertas Del Pino / Juan Pablo Varillas | |
| | | | |
| | | | |
| Romania | Chinese Taipei | |
|
|
RANK 225 | Nicholas David Ionel | 3-6 0-6 | Chun-Hsin Tseng | RANK 110 |
RANK 393 | Marius Copil | 6-7(5) 5-7 | Yu Hsiou Hsu | RANK 198 |
| Victor Vlad Cornea / Cezar Cretu | 1-6 4-6 | Yu Hsiou Hsu / Tsung-Hao Huang | |
RANK 418 | Cezar Cretu | 6-4 6-4 | Tung-Lin Wu | RANK 174 |
RANK 393 | Marius Copil | NOT PLAYED | Chun-Hsin Tseng | RANK 110 |
| | | | |
| | | | |
| Denmark | Brazil | |
|
|
RANK 9 | Holger Rune | 7-6(4) 6-7(5) 2-6 | Thiago Monteiro | RANK 78 |
RANK 484 | August Holmgren | 4-6 2-6 | Thiago Seyboth Wild | RANK 348 |
| Johannes Ingildsen / Christian Sigsgaard | 7-6(5) 5-7 6-7(5) | Rafael Matos / Felipe Meligeni Rodrigues Alves | |
RANK 718 | Elmer Moller | 6-3 6-7(6) 10-4 | Marcelo Demoliner | RANK |
RANK 484 | August Holmgren | NOT PLAYED | Thiago Monteiro | RANK 78 |
| | | | |