| Argentina (1) |
|---|
| Mayer, Leonardo |
| | Australia (3) |
|---|
| Ebden, Matthew | | Millman, John | | Popyrin, Alexei |
| | Canada (1) |
|---|
| Shapovalov, Denis |
| |
| | Francia (3) |
|---|
| Chardy, Jeremy | | Mannarino, Adrian | | Simon, Gilles |
| | Germania (4) |
|---|
| Gojowczyk, Peter | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grecia (1) |
|---|
| Tsitsipas, Stefano |
|
| Italia (2) |
|---|
| Cecchinato, Marco | | Seppi, Andreas |
| | | Lettonia (1) |
|---|
| Gulbis, Ernests |
| |
| Portogallo (1) |
|---|
| Sousa, Joao |
| | | Russia (1) |
|---|
| Medvedev, Daniil |
| | Serbia (3) |
|---|
| Djere, Laslo | | Krajinovic, Filip | | Lajovic, Dusan |
|
| Spagna (1) |
|---|
| Bautista Agut, Roberto |
| | Svizzera (3) |
|---|
| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| | Stati Uniti (3) |
|---|
| Fritz, Taylor | | Harrison, Ryan | | Sock, Jack |
|