| Argentina (2) |
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| Del Potro, Juan Martin | | Schwartzman, Diego |
| | Australia (2) |
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| Ebden, Matthew | | Kyrgios, Nick |
| | Austria (1) |
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| Thiem, Dominic |
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| Basic, Mirza | | Dzumhur, Damir |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
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| Croatia (2) |
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| Cilic, Marin | | Coric, Borna |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Paire, Benoit | | Pouille, Lucas |
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| Gojowczyk, Peter | | Zverev, Alexander |
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| Tsitsipas, Stefano |
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| Haase, Robin |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
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| Djokovic, Novak | | Krajinovic, Filip |
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| Anderson, Kevin |
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| Chung, Hyeon |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | | United Kingdom (1) |
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| Edmund, Kyle |
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| United States (9) |
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| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | McDonald, Mackenzie | | Querrey, Sam | | Sock, Jack | | Tiafoe, Frances |
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