| Argentina (1) |
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| Schwartzman, Diego |
| | Australia (3) |
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| De Minaur, Alex | | Ebden, Matthew | | Kyrgios, Nick |
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| Dzumhur, Damir |
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| Raonic, Milos | | Shapovalov, Denis |
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| | | Francia (5) |
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| Chardy, Jeremy | | Gasquet, Richard | | Mannarino, Adrian | | Paire, Benoit | | Simon, Gilles |
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| Marterer, Maximilian | | Struff, Jan-Lennard |
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| Tsitsipas, Stefano |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi | | Watanuki, Yosuke |
| | | Russia (1) |
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| Medvedev, Daniil |
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| Klizan, Martin |
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| Anderson, Kevin |
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| Wawrinka, Stan |
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| Stati Uniti (4) |
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| Fritz, Taylor | | Johnson, Steve | | Kudla, Denis | | Tiafoe, Frances |
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