| Argentina (1) |
|---|
| Schwartzman, Diego |
| | Australia (5) |
|---|
| De Minaur, Alex | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | | France (1) |
|---|
| Mannarino, Adrian |
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| Germany (3) |
|---|
| Gojowczyk, Peter | | Zverev, Alexander | | Zverev, Mischa |
| | Italy (2) |
|---|
| Gaio, Federico | | Seppi, Andreas |
| | Japan (1) |
|---|
| Nishioka, Yoshihito |
| | Mexico (1) |
|---|
| Lopez Villasenor, Gerardo |
|
| | | Spain (5) |
|---|
| Ferrer, David | | Garcia-Lopez, Guillermo | | Granollers, Marcel | | Lopez, Feliciano | | Nadal, Rafael |
| | Switzerland (1) |
|---|
| Wawrinka, Stan |
|
| United Kingdom (1) |
|---|
| Norrie, Cameron |
| | United States (9) |
|---|
| Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | McDonald, Mackenzie | | Nava, Emilio | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances |
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