| Argentina (1) |
|---|
| Londero, Juan Ignacio |
| | Australia (2) |
|---|
| De Minaur, Alex | | Popyrin, Alexei |
| | |
| | | Francia (2) |
|---|
| Gasquet, Richard | | Paire, Benoit |
| | Germania (3) |
|---|
| Gojowczyk, Peter | | Struff, Jan-Lennard | | Zverev, Alexander |
|
| Grecia (1) |
|---|
| Tsitsipas, Stefano |
| | | Lituania (1) |
|---|
| Berankis, Ricardas |
| |
| | Serbia (4) |
|---|
| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Spagna (3) |
|---|
| Andujar, Pablo | | Bautista Agut, Roberto | | Ramos-Vinolas, Albert |
| | Svizzera (3) |
|---|
| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
|
| Regno Unito (1) |
|---|
| Evans, Daniel |
| | Stati Uniti (3) |
|---|
| Fritz, Taylor | | Opelka, Reilly | | Tiafoe, Frances |
| |