| Argentina (8) |
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| Andreozzi, Guido | | Bagnis, Facundo | | Berlocq, Carlos | | Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australien (7) |
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| De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Thompson, Jordan |
| | Østrig (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Belgien (2) |
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| Bemelmans, Ruben | | Goffin, David |
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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 |
| |
| Kroatien (2) |
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| Cilic, Marin | | Coric, Borna |
| | Cypern (1) |
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| Baghdatis, Marcos |
| | | Frankrig (12) |
|---|
| Benneteau, Julien | | Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mahut, Nicolas | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
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| Georgien (1) |
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| Basilashvili, Nikoloz |
| | Tyskland (9) |
|---|
| Gojowczyk, Peter | | Hanfmann, Yannick | | Kohlschreiber, Philipp | | Maden, Yannick | | Marterer, Maximilian | | Mayer, Florian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grækenland (1) |
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| Tsitsipas, Stefano |
| | Ungarn (1) |
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| Fucsovics, Marton |
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| | Italien (8) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Gaio, Federico | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Japan (4) |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
| | Kasakhstan (1) |
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| Kukushkin, Mikhail |
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| Litauen (1) |
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| Berankis, Ricardas |
| | Luxembourg (1) |
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| Muller, Gilles |
| | |
| | | | Rumænien (1) |
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| Copil, Marius |
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| Rusland (5) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
| | Serbien (5) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Krajinovic, Filip | | Lajovic, Dusan | | Troicki, Viktor |
| | Slovakiet (1) |
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| Lacko, Lukas |
| | Slovenien (1) |
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| Bedene, Aljaz |
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| Sydafrika (2) |
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| Anderson, Kevin | | Harris, Lloyd |
| | | Spanien (12) |
|---|
| Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Granollers, Marcel | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Robredo, Tommy | | Verdasco, Fernando |
| | Schweizisk (2) |
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| Federer, Roger | | Wawrinka, Stan |
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| Tunesien (1) |
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| Jaziri, Malek |
| | Storbritannien (3) |
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| Edmund, Kyle | | Murray, Andy | | Norrie, Cameron |
| | USA (18) |
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| Altamirano, Collin | | Brooksby, Jenson | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Krueger, Mitchell | | Kudla, Denis | | McDonald, Mackenzie | | Mmoh, Michael | | Querrey, Sam | | Rubin, Noah | | Sandgren, Tennys | | Smyczek, Tim | | Sock, Jack | | Tiafoe, Frances | | Young, Donald |
| | Usbekistan (1) |
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| Istomin, Denis |
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