| Austria (1) |
|---|
| Thiem, Dominic |
| | | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Croazia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
|
| Repubblica Ceca (1) |
|---|
| Berdych, Tomas |
| | Francia (7) |
|---|
| Gasquet, Richard | | Herbert, Pierre-Hugues | | Mahut, Nicolas | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Germania (4) |
|---|
| Kohlschreiber, Philipp | | Mayer, Florian | | Zverev, Alexander | | Zverev, Mischa |
| | Grecia (1) |
|---|
| Tsitsipas, Stefano |
|
| Lussemburgo (1) |
|---|
| Muller, Gilles |
| | Olanda (2) |
|---|
| Griekspoor, Tallon | | Haase, Robin |
| | | Russia (3) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Kuznetsov, Andrey |
|
| Serbia (1) |
|---|
| Troicki, Viktor |
| | Slovacchia (1) |
|---|
| Klizan, Martin |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
| | Spagna (3) |
|---|
| Granollers, Marcel | | Lopez, Feliciano | | Verdasco, Fernando |
|
| Usbechistan (1) |
|---|
| Istomin, Denis |
|