| Argentina (1) |
|---|
| Mayer, Leonardo |
| | Australia (8) |
|---|
| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Kokkinakis, Thanasi | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| |
| France (3) |
|---|
| Chardy, Jeremy | | Humbert, Ugo | | Tsonga, Jo-Wilfried |
| | Germany (1) |
|---|
| Struff, Jan-Lennard |
| | Japan (4) |
|---|
| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Uchiyama, Yasutaka |
| | Russia (1) |
|---|
| Medvedev, Daniil |
|
| Serbia (1) |
|---|
| Kecmanovic, Miomir |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
| | | United Kingdom (2) |
|---|
| Edmund, Kyle | | Murray, Andy |
|
| United States (4) |
|---|
| Fritz, Taylor | | Harrison, Ryan | | Kudla, Denis | | Sandgren, Tennys |
|