| Argentina (3) |
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| Del Potro, Juan Martin | | Mayer, Leonardo | | Schwartzman, Diego |
| | Australia (3) |
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| De Minaur, Alex | | Ebden, Matthew | | Kyrgios, Nick |
| | Austria (1) |
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| Thiem, Dominic |
| | Bosnia and Herzegovina (1) |
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| Dzumhur, Damir |
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| Canada (3) |
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| Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
| | | China (3) |
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| Li, Zhe | | Wu, Yibing | | Zhang, Ze |
| | Croatia (2) |
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| Cilic, Marin | | Coric, Borna |
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| France (6) |
|---|
| Chardy, Jeremy | | Gasquet, Richard | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Simon, Gilles |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (4) |
|---|
| Gojowczyk, Peter | | Marterer, Maximilian | | Zverev, Alexander | | Zverev, Mischa |
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| Tsitsipas, Stefano |
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| Hungary (1) |
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| Fucsovics, Marton |
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|---|
| Cecchinato, Marco | | Seppi, Andreas |
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| Kukushkin, Mikhail |
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| Haase, Robin |
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| Hurkacz, Hubert |
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| Djokovic, Novak | | Krajinovic, Filip |
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| South Africa (1) |
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| Anderson, Kevin |
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| Chung, Hyeon |
| | Spain (3) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ramos-Vinolas, Albert |
| | Swiss (2) |
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| Federer, Roger | | Wawrinka, Stan |
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| United Kingdom (1) |
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| Edmund, Kyle |
| | United States (7) |
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| Fritz, Taylor | | Johnson, Steve | | Klahn, Bradley | | McDonald, Mackenzie | | Querrey, Sam | | Sock, Jack | | Tiafoe, Frances |
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