| | | | |
|  Colombia |  Luxembourg | |
|
|
RANK 411 | Nicolas Mejia | 6-7(3) 3-6 | Chris Rodesch | RANK 648 |
RANK 593 | Adria Soriano Barrera | 4-6 6-2 4-6 | Alex Knaff | RANK 500 |
| Nicolas Barrientos / Cristian Rodriguez | 6-3 6-7(1) 6-1 | Krasimir Kolev / Manuel Righi | |
RANK 411 | Nicolas Mejia | 6-2 6-3 | Alex Knaff | RANK 500 |
RANK 593 | Adria Soriano Barrera | 6-3 7-6(5) | Chris Rodesch | RANK 648 |
| | | | |
| | | | |
|  Lebanon |  Japan | |
|
|
RANK 304 | Hady Habib | 3-6 4-6 | Yoshihito Nishioka | RANK 84 |
RANK 152 | Benjamin Hassan | 6-2 7-6(3) | Yosuke Watanuki | RANK 113 |
| Matthias Haim / Roger Jr. Hernandez | 5-7 5-7 | Yoshihito Nishioka / Matthias Wolf | |
RANK 152 | Benjamin Hassan | 6-1 6-7(2) 4-6 | Yoshihito Nishioka | RANK 84 |
RANK 304 | Hady Habib | NOT PLAYED | Yosuke Watanuki | RANK 113 |
| | | | |
| | | | |
|  Ireland |  Austria | |
|
|
RANK 935 | Michael Agwi | 6-7(6) 3-6 | Dominic Thiem | RANK 90 |
RANK 1015 | Osgar O'Hoisin | 4-6 4-6 | Sebastian Ofner | RANK 40 |
| Philippe Gelade / | 1-6 6-7(5) | Sebastian Eguez / David Marrero | |
RANK 935 | Michael Agwi | 3-6 6-3 8-10 | Lucas Miedler | RANK 1071 |
RANK 1015 | Osgar O'Hoisin | NOT PLAYED | Dominic Thiem | RANK 90 |
| | | | |
| | | | |
|  Egypt |  Ecuador | |
|
|
RANK 358 | Mohamed Safwat | 4-6 7-6(6) 7-6(6) | Alvaro Guillen Meza | RANK 312 |
RANK 735 | Amr Asrawy | 7-5 6-3 | Emilio Gomez | RANK 307 |
| Pedro Mol / Mohamed Safwat | 7-6(5) 7-6(3) | Facundo Alvo / Diego Hidalgo | |
RANK 1090 | Michael Bassem Sobhy | 6-4 5-7 7-10 | Andres Andrade | RANK 669 |
RANK 735 | Amr Asrawy | NOT PLAYED | Alvaro Guillen Meza | RANK 312 |
| | | | |
| | | | |
|  Norway |  Latvia | |
|
|
RANK 413 | Viktor Durasovic | 7-5 6-2 | Robert Strombachs | RANK 346 |
RANK 12 | Casper Ruud | 6-1 6-1 | Martins Rocens | RANK 1763 |
| Viktor Durasovic / Rafael Rondino | 6-1 6-3 | Hunter Reese / Louk Sorensen | |
RANK 413 | Viktor Durasovic | NOT PLAYED | Martins Rocens | RANK 1763 |
| | | | |
| | | | |
|  Greece |  Romania | |
|
|
RANK 10 | Stefanos Tsitsipas | 6-3 6-4 | Marius Copil | RANK 283 |
RANK 1433 | Aristotelis Thanos | 4-6 6-3 6-2 | Nicholas David Ionel | RANK 265 |
| Danny Thomas / Matias-Omar Tello | 6-7(4) 6-3 6-4 | Marius Copil / Victor Vlad Cornea | |
RANK 1286 | Ioannis Xilas | 6-1 6-4 | Luca Preda | RANK 1099 |
RANK 1433 | Aristotelis Thanos | NOT PLAYED | Marius Copil | RANK 283 |
| | | | |
| | | | |
|  Bulgaria |  Bosnia and Herzegovina | |
|
|
RANK 225 | Dimitar Kuzmanov | 6-3 3-6 4-6 | Nerman Fatic | RANK 204 |
RANK 550 | Yanaki Milev | 3-6 2-6 | Damir Dzumhur | RANK 147 |
| Demur Davitadze / Santtu Leskinen | 6-7(10) 3-6 | Mirza Basic / Damir Dzumhur | |
RANK 564 | Petr Nesterov | 4-6 6-2 10-8 | Andrej Nedic | RANK 591 |
RANK 550 | Yanaki Milev | NOT PLAYED | Nerman Fatic | RANK 204 |
| | | | |
| | | | |
|  Poland |  Uzbekistan | |
|
|
RANK 8 | Hubert Hurkacz | 6-2 6-1 | Sergey Fomin | RANK 665 |
RANK 271 | Maks Kasnikowski | 6-3 6-1 | Khumoyun Sultanov | RANK 330 |
| Gregor Hutterer / | 7-6(1) 6-4 | Vladimir Filip / Khumoyun Sultanov | |
RANK 807 | Kamil Majchrzak | 6-1 6-1 | Maxim Shin | RANK 1469 |
RANK 271 | Maks Kasnikowski | NOT PLAYED | Sergey Fomin | RANK 665 |
| | | | |
| | | | |
|  New Zealand |  Turkey | |
|
|
RANK 716 | Kiranpal Pannu | 6-3 6-2 | Cem Ilkel | RANK 284 |
RANK 538 | Ajeet Rai | 7-6(5) 2-6 4-6 | Yanki Erel | RANK 325 |
| Marcus Daniell / Ivan Randjelovic | 6-3 3-6 6-7(5) | Altug Celikbilek / Mihail Khaldeev | |
RANK 538 | Ajeet Rai | 3-6 2-6 | Altug Celikbilek | RANK 371 |
RANK 716 | Kiranpal Pannu | NOT PLAYED | Yanki Erel | RANK 325 |
| | | | |
| | | | |
|  Mexico |  Denmark | |
|
|
RANK 493 | Ernesto Escobedo | 7-5 2-6 2-6 | Elmer Moller | RANK 361 |
RANK 696 | Rodrigo Pacheco Mendez | 7-6(5) 6-7(2) 6-3 | August Holmgren | RANK 292 |
| Hans Hach / Miguel-Angel Reyes-Varela | 6-7(1) 7-6(1) 4-6 | Lenny Hampel / Mateusz Izycki | |
RANK 493 | Ernesto Escobedo | 4-6 4-6 | August Holmgren | RANK 292 |
RANK 696 | Rodrigo Pacheco Mendez | NOT PLAYED | Elmer Moller | RANK 361 |
| | | | |
| | | | |
|  Pakistan |  India | |
|
|
RANK | Aisam Qureshi | 7-6(3) 6-7(4) 0-6 | Ramkumar Ramanathan | RANK 461 |
RANK | Aqeel Khan | 5-7 3-6 | N.Sriram Balaji | RANK |
| Maxim Kravtsov / Lorenzo Musetti | 2-6 6-7(5) | Yuki Bhambri / Saketh Myneni | |
RANK | Muhammad Shoaib | 3-6 4-6 | Niki Kaliyanda Poonacha | RANK 795 |
RANK | Aisam Qureshi | NOT PLAYED | N.Sriram Balaji | RANK |
| | | | |
| | | | |
|  Lithuania |  Georgia | |
|
|
RANK 366 | Vilius Gaubas | 3-6 6-1 5-7 | Saba Purtseladze | RANK 450 |
RANK 248 | Ricardas Berankis | 6-2 6-2 | Zura Tkemaladze | RANK 721 |
| Tony Bourcet / Antonin Scaff Haddad Bartos | 5-7 6-4 4-6 | Justin Butsch / Aleksandre Metreveli | |
RANK 248 | Ricardas Berankis | 7-6(5) 3-6 7-6(7) | Saba Purtseladze | RANK 450 |
RANK 366 | Vilius Gaubas | 7-5 6-3 | Zura Tkemaladze | RANK 721 |
| | | | |