| Argentina (3) |
|---|
| Del Potro, Juan Martin | | Pella, Guido | | Schwartzman, Diego |
| | Australia (3) |
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| De Minaur, Alex | | Kyrgios, Nick | | Millman, John |
| | Austria (1) |
|---|
| Thiem, Dominic |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Cilic, Marin | | Coric, Borna |
| | Francia (7) |
|---|
| Chardy, Jeremy | | Gasquet, Richard | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
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| Georgia (1) |
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| Basilashvili, Nikoloz |
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| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Fucsovics, Marton |
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| Italia (7) |
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| Basso, Andrea | | Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo |
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| Nishikori, Kei | | Nishioka, Yoshihito |
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| Kukushkin, Mikhail |
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| Sousa, Joao |
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| Khachanov, Karen | | Medvedev, Daniil |
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| Djere, Laslo | | Djokovic, Novak |
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| Spagna (5) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Svizzera (2) |
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| Federer, Roger | | Wawrinka, Stan |
| | Regno Unito (3) |
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| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
| | Stati Uniti (3) |
|---|
| Fritz, Taylor | | Johnson, Steve | | Tiafoe, Frances |
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