| Australia (3) |
|---|
| De Minaur, Alex | | Kyrgios, Nick | | Millman, John |
| | Bosnia and Herzegovina (1) |
|---|
| Dzumhur, Damir |
| | China (3) |
|---|
| Wu, Di | | Zhang, Ze | | Zhang, Zhizhen |
| |
| France (3) |
|---|
| Mannarino, Adrian | | Monfils, Gael | | Pouille, Lucas |
| | Germany (2) |
|---|
| Gojowczyk, Peter | | Koepfer, Dominik |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Italy (2) |
|---|
| Cecchinato, Marco | | Seppi, Andreas |
|
| Japan (2) |
|---|
| Ito, Tatsuma | | Nishioka, Yoshihito |
| | | Serbia (1) |
|---|
| Kecmanovic, Miomir |
| | South Korea (1) |
|---|
| Kwon, Soonwoo |
|
| Spain (3) |
|---|
| Andujar, Pablo | | Bautista Agut, Roberto | | Ramos-Vinolas, Albert |
| | United Kingdom (2) |
|---|
| Murray, Andy | | Norrie, Cameron |
| | United States (2) |
|---|
| Johnson, Steve | | Sandgren, Tennys |
|