| Argentina (6) |
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| Del Potro, Juan Martin | | Kicker, Nicolas | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Zeballos, Horacio |
| | Australia (5) |
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| De Minaur, Alex | | Ebden, Matthew | | Kokkinakis, Thanasi | | Kyrgios, Nick | | Millman, John |
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| Bosnia y Herzegovina (2) |
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| Basic, Mirza | | Dzumhur, Damir |
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| Dutra Silva, Rogerio |
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| Dimitrov, Grigor |
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| Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
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| Baghdatis, Marcos |
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| Berdych, Tomas | | Vesely, Jiri |
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| Estrella Burgos, Victor |
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| Chardy, Jeremy | | Gasquet, Richard | | Hemery, Calvin | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Paire, Benoit | | Simon, Gilles |
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| Basilashvili, Nikoloz |
| | Alemania (6) |
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| Gojowczyk, Peter | | Kuhn, Nicola | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Tsitsipas, Stefano |
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| Fucsovics, Marton |
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| Fabbiano, Thomas | | Fognini, Fabio |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
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| Kukushkin, Mikhail |
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| Muller, Gilles |
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| Haase, Robin |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
| | Serbia (5) |
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| Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Troicki, Viktor |
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| Lacko, Lukas |
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| Bedene, Aljaz |
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| Anderson, Kevin |
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| Chung, Hyeon |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Verdasco, Fernando |
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| | Reino Unido (3) |
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| Broady, Liam | | Edmund, Kyle | | Norrie, Cameron |
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| Donaldson, Jared | | Eubanks, Christopher | | Fratangelo, Bjorn | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Mmoh, Michael | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances | | Young, Donald |
| | Uzbekistán (1) |
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| Istomin, Denis |
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