| | | | |
|  Serbia |  Greece | |
|
|
RANK 41 | Miomir Kecmanovic | 6-3 6-3 | Aristotelis Thanos | RANK 1433 |
RANK 1 | Novak Djokovic | 6-0 6-1 | Ioannis Xilas | RANK 1286 |
| Novak Djokovic / Hamad Medjedovic | 6-3 3-6 6-3 | Aristotelis Thanos / Petros Tsitsipas | |
RANK 53 | Dusan Lajovic | 6-1 2-3 RET | Demetris Azoides | RANK 1270 |
RANK 41 | Miomir Kecmanovic | NOT PLAYED | Ioannis Xilas | RANK 1286 |
| | | | |
| | | | |
|  Croatia |  Lithuania | |
|
|
RANK 91 | Borna Gojo | 6-4 6-2 | Vilius Gaubas | RANK 366 |
RANK 125 | Duje Ajdukovic | 7-5 6-7(6) 6-2 | Edas Butvilas | RANK 638 |
| Mate Pavic / Mili Poljicak | 6-4 1-6 6-3 | Edas Butvilas / Vilius Gaubas | |
RANK 497 | Matej Dodig | 6-3 6-4 | Vilius Gaubas | RANK 366 |
RANK 91 | Borna Gojo | NOT PLAYED | Edas Butvilas | RANK 638 |
| | | | |
| | | | |
|  Sweden |  India | |
|
|
RANK 160 | Elias Ymer | 6-4 6-2 | N.Sriram Balaji | RANK |
RANK 394 | Leo Borg | 6-3 6-4 | Ramkumar Ramanathan | RANK 461 |
| Filip Bergevi / Andre Goransson | 6-3 6-4 | N.Sriram Balaji / Ramkumar Ramanathan | |
RANK 160 | Elias Ymer | 6-2 6-2 | Siddharth Vishwakarma | RANK 682 |
RANK 394 | Leo Borg | NOT PLAYED | N.Sriram Balaji | RANK |
| | | | |
| | | | |
|  Kazakhstan |  Denmark | |
|
|
RANK 27 | Alexander Bublik | 6-1 2-6 2-6 | Elmer Moller | RANK 361 |
RANK 59 | Alexander Shevchenko | 6-7(4) 3-6 | August Holmgren | RANK 292 |
| Alexander Bublik / Aleksandr Nedovyesov | 6-7(7) 3-6 | August Holmgren / Johannes Ingildsen | |
RANK 189 | Beibit Zhukayev | 3-6 6-4 10-8 | Philip Hjorth | RANK 1629 |
RANK 59 | Alexander Shevchenko | NOT PLAYED | Elmer Moller | RANK 361 |
| | | | |
| | | | |
|  South Korea |  Poland | |
|
|
RANK 224 | Seong Chan Hong | 7-6(8) 6-2 | Maks Kasnikowski | RANK 271 |
RANK 700 | Soonwoo Kwon | 7-5 7-6(3) | Kamil Majchrzak | RANK 807 |
| Yunseong Chung / Ji Sung Nam | 7-6(3) 4-6 6-3 | Karol Drzewiecki / Jan Zielinski | |
RANK | Min-Kyu Song | 3-6 4-6 | Martyn Pawelski | RANK 484 |
RANK 700 | Soonwoo Kwon | NOT PLAYED | Maks Kasnikowski | RANK 271 |
| | | | |
| | | | |
|  Switzerland |  Peru | |
|
|
RANK 431 | Jerome Kym | 6-1 6-4 | Ignacio Buse | RANK 438 |
RANK 199 | Marc-Andrea Huesler | 6-3 6-4 | Juan Pablo Varillas | RANK 87 |
| Marc-Andrea Huesler / Dominic Stricker | 7-5 6-1 | Arklon Huertas Del Pino / Conner Huertas Del Pino | |
RANK 407 | Remy Bertola | 5-7 7-5 10-5 | Gonzalo Bueno | RANK 324 |
RANK 199 | Marc-Andrea Huesler | NOT PLAYED | Ignacio Buse | RANK 438 |
| | | | |
| | | | |
|  Egypt |  Hungary | |
|
|
RANK 735 | Amr Asrawy | 7-5 3-6 4-6 | Zsombor Piros | RANK 129 |
RANK 358 | Mohamed Safwat | 6-3 5-7 7-6(5) | Mate Valkusz | RANK 213 |
| Karim-Mohamed Maamoun / Mohamed Safwat | 7-6(6) 7-6(4) | Peter Fajta / Gergely Madarasz | |
RANK 358 | Mohamed Safwat | 6-7(3) 1-6 | Zsombor Piros | RANK 129 |
RANK 1143 | Faris Zakaryia | 3-6 4-6 | Mate Valkusz | RANK 213 |
| | | | |
| | | | |
|  Norway |  Portugal | |
|
|
RANK | Nicolai Budkov Kjaer | 4-6 6-3 7-6(4) | Jaime Faria | RANK 392 |
RANK 12 | Casper Ruud | 3-6 4-6 | Henrique Rocha | RANK 243 |
| Viktor Durasovic / Casper Ruud | 7-5 6-3 | Francisco Cabral / Jaime Faria | |
RANK 12 | Casper Ruud | 7-6(3) 6-2 | Jaime Faria | RANK 392 |
RANK | Nicolai Budkov Kjaer | NOT PLAYED | Henrique Rocha | RANK 243 |
| | | | |
| | | | |
|  Austria |  Turkey | |
|
|
RANK 108 | Jurij Rodionov | 6-3 6-4 | Yanki Erel | RANK 325 |
RANK 231 | Lukas Neumayer | 7-6(3) 6-2 | Cem Ilkel | RANK 284 |
| Alexander Erler / Lucas Miedler | 6-3 6-4 | Altug Celikbilek / Yanki Erel | |
RANK 231 | Lukas Neumayer | 7-6(3) 6-2 | Cem Ilkel | RANK 284 |
RANK 108 | Jurij Rodionov | NOT PLAYED | Cem Ilkel | RANK 284 |
| | | | |
| | | | |
|  Chinese Taipei |  Bosnia and Herzegovina | |
|
|
RANK 305 | Chun-Hsin Tseng | 6-3 5-7 4-6 | Mirza Basic | RANK 643 |
RANK 238 | Tung-Lin Wu | 6-2 6-1 | Damir Dzumhur | RANK 147 |
| Ray Ho / Yu Hsiou Hsu | 6-3 6-4 | Mirza Basic / Nerman Fatic | |
RANK 305 | Chun-Hsin Tseng | 4-6 6-2 2-6 | Damir Dzumhur | RANK 147 |
RANK 238 | Tung-Lin Wu | 6-1 6-4 | Mirza Basic | RANK 643 |
| | | | |
| | | | |
|  Ukraine |  Israel | |
|
|
RANK 951 | Oleksandr Ovcharenko | 6-0 4-6 4-6 | Yshai Oliel | RANK 415 |
RANK 165 | Vitaliy Sachko | 2-6 2-6 | Daniel Cukierman | RANK 465 |
| Illya Beloborodko / Oleksii Krutykh | 7-5 7-6(7) | Daniel Cukierman / Roy Stepanov | |
RANK 342 | Oleksii Krutykh | 2-6 6-3 6-7(3) | Yshai Oliel | RANK 415 |
RANK 951 | Oleksandr Ovcharenko | NOT PLAYED | Daniel Cukierman | RANK 465 |
| | | | |
| | | | |
| Israel | Ukraine | |
|
|
RANK 415 | Yshai Oliel | 6-0 4-6 4-6 | Oleksandr Ovcharenko | RANK 951 |
RANK 465 | Daniel Cukierman | 2-6 2-6 | Vitaliy Sachko | RANK 165 |
| Daniel Cukierman / Roy Stepanov | 5-7 6-7(7) | Illya Beloborodko / Oleksii Krutykh | |
RANK 415 | Yshai Oliel | 2-6 6-3 6-7(3) | Oleksii Krutykh | RANK 342 |
RANK 465 | Daniel Cukierman | NOT PLAYED | Oleksandr Ovcharenko | RANK 951 |
| | | | |
| | | | |
|  Japan |  Colombia | |
|
|
RANK 84 | Yoshihito Nishioka | 6-2 6-4 | Adria Soriano Barrera | RANK 593 |
RANK 349 | Kei Nishikori | 6-4 6-4 | Nicolas Mejia | RANK 411 |
| Shintaro Mochizuki / Yosuke Watanuki | 7-6(4) 2-6 3-6 | Nicolas Barrientos / Cristian Rodriguez | |
RANK 84 | Yoshihito Nishioka | 7-5 6-4 | Nicolas Mejia | RANK 411 |
RANK 349 | Kei Nishikori | NOT PLAYED | Adria Soriano Barrera | RANK 593 |
| | | | |