| Argentina (5) |
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| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (7) |
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| Bolt, Alex | | De Minaur, Alex | | Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
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| Thiem, Dominic |
| |
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| Dzumhur, Damir |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Raonic, Milos | | Shapovalov, Denis |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Berdych, Tomas |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
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| Georgia (1) |
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| Basilashvili, Nikoloz |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Kukushkin, Mikhail |
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| Haase, Robin |
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| | | | Russland (3) |
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| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Federer, Roger | | Wawrinka, Stan |
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| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
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| Donaldson, Jared | | Fratangelo, Bjorn | | Fritz, Taylor | | Giron, Marcos | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | McDonald, Mackenzie | | Opelka, Reilly | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances | | Young, Donald |
| | Uzbekistan (1) |
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| Istomin, Denis |
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