| Argentina (2) |
|---|
| Pella, Guido | | Schwartzman, Diego |
| | Australia (1) |
|---|
| Kokkinakis, Thanasi |
| | Austria (1) |
|---|
| Thiem, Dominic |
| | Bielorussia (1) |
|---|
| Ivashka, Ilya |
|
| | Bosnia-Erzegovina (2) |
|---|
| Basic, Mirza | | Dzumhur, Damir |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (3) |
|---|
| Auger-Aliassime, Felix | | Raonic, Milos | | Shapovalov, Denis |
|
| Croazia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
| | Repubblica Ceca (1) |
|---|
| Berdych, Tomas |
| | Francia (8) |
|---|
| Benneteau, Julien | | Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
| | Germania (6) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Mayer, Florian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
|
| Grecia (1) |
|---|
| Tsitsipas, Stefano |
| | Ungheria (1) |
|---|
| Fucsovics, Marton |
| | Italia (4) |
|---|
| Cecchinato, Marco | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas |
| | Giappone (2) |
|---|
| Nishikori, Kei | | Sugita, Yuichi |
|
| Lussemburgo (1) |
|---|
| Muller, Gilles |
| | Monaco (1) |
|---|
| Catarina, Lucas |
| | | Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
|
| Serbia (2) |
|---|
| Djokovic, Novak | | Lajovic, Dusan |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
| | Spagna (7) |
|---|
| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Regno Unito (1) |
|---|
| Edmund, Kyle |
|
| Stati Uniti (2) |
|---|
| Donaldson, Jared | | Sandgren, Tennys |
| |