| Argentina (2) |
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| Del Potro, Juan Martin | | Schwartzman, Diego |
| | Australien (2) |
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| Ebden, Matthew | | Kyrgios, Nick |
| | | Hviderusland (1) |
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| Ivashka, Ilya |
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| | Bosnien og Herzegovina (2) |
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| Basic, Mirza | | Dzumhur, Damir |
| | Bulgarien (1) |
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| Dimitrov, Grigor |
| | Canada (5) |
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| Auger-Aliassime, Felix | | Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
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| Kroatien (2) |
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| Cilic, Marin | | Coric, Borna |
| | Frankrig (5) |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Paire, Benoit | | Pouille, Lucas |
| | Tyskland (2) |
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| Gojowczyk, Peter | | Zverev, Alexander |
| | Grækenland (1) |
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| Tsitsipas, Stefano |
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| Ungarn (1) |
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| Fucsovics, Marton |
| | Italien (2) |
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| Cecchinato, Marco | | Fognini, Fabio |
| | Japan (3) |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
| |
| | Rusland (5) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
| | Serbien (2) |
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| Djokovic, Novak | | Krajinovic, Filip |
| | Sydafrika (1) |
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| Anderson, Kevin |
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| | Spanien (6) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Schweizisk (1) |
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| Wawrinka, Stan |
| | Storbritannien (1) |
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| Edmund, Kyle |
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| USA (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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