| Argentina (3) |
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| Del Potro, Juan Martin | | Pella, Guido | | Schwartzman, Diego |
| | Australia (3) |
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| De Minaur, Alex | | Kyrgios, Nick | | Millman, John |
| | Austria (1) |
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| Thiem, Dominic |
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| | Bulgaria (1) |
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| Dimitrov, Grigor |
| | Canadá (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Croacia (2) |
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| Cilic, Marin | | Coric, Borna |
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| Francia (7) |
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| Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Monfils, Gael | | Pouille, Lucas | | Simon, Gilles |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Alemania (3) |
|---|
| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Tsitsipas, Stefano |
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| Hungría (1) |
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| Fucsovics, Marton |
| | Italia (3) |
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| Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas |
| | | Kazajstán (1) |
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| Kukushkin, Mikhail |
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| | Polonia (1) |
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| Hurkacz, Hubert |
| | | Rusia (2) |
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| Khachanov, Karen | | Medvedev, Daniil |
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| Serbia (3) |
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| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan |
| | Eslovaquia (1) |
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| Klizan, Martin |
| | España (8) |
|---|
| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Ferrer, David | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Suiza (2) |
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| Federer, Roger | | Wawrinka, Stan |
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| Reino Unido (1) |
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| Edmund, Kyle |
| | Estados Unidos (4) |
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| Fritz, Taylor | | Johnson, Steve | | Opelka, Reilly | | Tiafoe, Frances |
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