| Argentina (4) |
|---|
| Baez, Sebastian | | Cerundolo, Francisco | | Etcheverry, Tomas Martin | | Navone, Mariano |
| | Australien (4) |
|---|
| De Minaur, Alex | | Ebden, Matthew | | Hijikata, Rinky | | Popyrin, Alexei |
| | Østrig (1) |
|---|
| Ofner, Sebastian |
| |
| Brasilien (2) |
|---|
| Monteiro, Thiago | | Seyboth Wild, Thiago |
| | Canada (2) |
|---|
| Auger-Aliassime, Felix | | Raonic, Milos |
| | Chile (3) |
|---|
| Barrios Vera, Tomas | | Jarry, Nicolas | | Tabilo, Alejandro |
| |
| Tjekkiet (2) |
|---|
| Machac, Tomas | | Mensik, Jakub |
| | Frankrig (4) |
|---|
| Fils, Arthur | | Humbert, Ugo | | Monfils, Gael | | Moutet, Corentin |
| | Tyskland (4) |
|---|
| Koepfer, Dominik | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grækenland (2) |
|---|
| Tsitsipas, Petros | | Tsitsipas, Stefanos |
|
| Ungarn (2) |
|---|
| Fucsovics, Marton | | Marozsan, Fabian |
| | | Italien (4) |
|---|
| Arnaldi, Matteo | | Darderi, Luciano | | Musetti, Lorenzo | | Vavassori, Andrea |
| | Japan (2) |
|---|
| Daniel, Taro | | Nishikori, Kei |
|
| Kasakhstan (2) |
|---|
| Bublik, Alexander | | Shevchenko, Alexander |
| | Libanon (2) |
|---|
| Habib, Hady | | Hassan, Benjamin |
| | Holland (2) |
|---|
| Griekspoor, Tallon | | Haase, Robin |
| |
| Portugal (2) |
|---|
| Borges, Nuno | | Cabral, Francisco |
| | Rusland (3) |
|---|
| Kotov, Pavel | | Medvedev, Daniil | | Safiullin, Roman |
| | Serbien (2) |
|---|
| Djokovic, Novak | | Lajovic, Dusan |
| | Spanien (4) |
|---|
| Alcaraz, Carlos | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael |
|
| Schweizisk (1) |
|---|
| Wawrinka, Stan |
| | Tunesien (1) |
|---|
| Echargui, Moez |
| | Storbritannien (3) |
|---|
| Draper, Jack | | Evans, Daniel | | Norrie, Cameron |
| | USA (4) |
|---|
| Eubanks, Christopher | | Fritz, Taylor | | Giron, Marcos | | Paul, Tommy |
|