| Argentina (3) |
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| Berlocq, Carlos | | Del Potro, Juan Martin | | Schwartzman, Diego |
| | Australia (2) |
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| Kyrgios, Nick | | Tomic, Bernard |
| | Austria (1) |
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| Thiem, Dominic |
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| Brasile (2) |
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| Bellucci, Thomaz | | Monteiro, Thiago |
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| Dimitrov, Grigor |
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| Cilic, Marin | | Karlovic, Ivo |
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| Repubblica Ceca (2) |
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| Berdych, Tomas | | Vesely, Jiri |
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| Mahut, Nicolas | | Mannarino, Adrian | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
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| Haas, Tommy | | Mayer, Florian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Italia (5) |
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| Berrettini, Matteo | | Fognini, Fabio | | Mager, Gianluca | | Napolitano, Stefano | | Seppi, Andreas |
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| Djokovic, Novak | | Troicki, Viktor |
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| Bedene, Aljaz |
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| Anderson, Kevin |
| | Spagna (8) |
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| Almagro, Nicolas | | Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
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| Svizzera (1) |
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| Wawrinka, Stan |
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| Dolgopolov, Alexandr |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy |
| | Stati Uniti (6) |
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| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Querrey, Sam | | Sock, Jack | | Young, Donald |
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