| Argentinië (3) |
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| Del Potro, Juan Martin | | Pella, Guido | | Schwartzman, Diego |
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| De Minaur, Alex | | Kyrgios, Nick | | Millman, John |
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| Thiem, Dominic |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Cilic, Marin | | Coric, Borna |
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|---|
| Chardy, Jeremy | | Gasquet, Richard | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
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| Basilashvili, Nikoloz |
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| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Tsitsipas, Stefano |
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| Fucsovics, Marton |
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| Italië (7) |
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| Nishikori, Kei | | Nishioka, Yoshihito |
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| Kukushkin, Mikhail |
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| Khachanov, Karen | | Medvedev, Daniil |
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| Djere, Laslo | | Djokovic, Novak |
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| Spanje (5) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
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| Federer, Roger | | Wawrinka, Stan |
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| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
| | Verenigde Staten (3) |
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| Fritz, Taylor | | Johnson, Steve | | Tiafoe, Frances |
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