| Argentina (1) |
|---|
| Pella, Guido |
| | Australia (1) |
|---|
| Thompson, Jordan |
| | | Brasil (1) |
|---|
| Monteiro, Thiago |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | Canada (1) |
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| Shapovalov, Denis |
| | Chile (1) |
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| Garin, Christian |
| |
| France (3) |
|---|
| Cazaux, Arthur | | Mannarino, Adrian | | Paire, Benoit |
| | Germany (2) |
|---|
| Altmaier, Daniel | | Koepfer, Dominik |
| | Hungary (1) |
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| Fucsovics, Marton |
| | Italy (4) |
|---|
| Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Travaglia, Stefano |
|
| | | Spain (3) |
|---|
| Andujar, Pablo | | Lopez, Feliciano | | Verdasco, Fernando |
| | Swiss (3) |
|---|
| Federer, Roger | | Laaksonen, Henri | | Stricker, Dominic Stephan |
|
| United States (3) |
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| McDonald, Mackenzie | | Opelka, Reilly | | Sandgren, Tennys |
| |