| Argentina (7) |
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| Del Potro, Juan Martin | | Delbonis, Federico | | Kicker, Nicolas | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Zeballos, Horacio |
| | Austrálie (9) |
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| Bolt, Alex | | De Minaur, Alex | | Ebden, Matthew | | Kokkinakis, Thanasi | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | Rakousko (4) |
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| Haider-Maurer, Andreas | | Melzer, Gerald | | Novak, Dennis | | Thiem, Dominic |
| | Belgie (2) |
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| Bemelmans, Ruben | | Goffin, David |
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| Bosna a Hercegovina (1) |
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| Dzumhur, Damir |
| | Brazílie (1) |
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| Dutra Silva, Rogerio |
| | Bulharsko (1) |
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| Dimitrov, Grigor |
| | Kanada (4) |
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| Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
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| | Chorvatsko (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Kypr (1) |
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| Baghdatis, Marcos |
| | Česká republika (3) |
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| Berdych, Tomas | | Safranek, Vaclav | | Vesely, Jiri |
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| Dominikánská republika (1) |
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| Estrella Burgos, Victor |
| | Francie (12) |
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| Benneteau, Julien | | Chardy, Jeremy | | Gasquet, Richard | | Halys, Quentin | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Gruzie (1) |
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| Basilashvili, Nikoloz |
| | Německo (10) |
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| Bachinger, Matthias | | Brown, Dustin | | Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Mayer, Florian | | Stebe, Cedrik-Marcel | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Řecko (1) |
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| Tsitsipas, Stefano |
| | Maďarsko (1) |
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| Fucsovics, Marton |
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| Itálie (7) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo |
| | Japonsko (3) |
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| Daniel, Taro | | Nishioka, Yoshihito | | Sugita, Yuichi |
| | Kazachstán (1) |
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| Kukushkin, Mikhail |
| | Litva (1) |
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| Berankis, Ricardas |
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| Lucembursko (1) |
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| Muller, Gilles |
| | | Nizozemsko (1) |
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| Haase, Robin |
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| Portugalsko (1) |
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| Sousa, Joao |
| | Rumunsko (1) |
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| Copil, Marius |
| | Rusko (5) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
| | Srbsko (4) |
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| Djere, Laslo | | Djokovic, Novak | | Lajovic, Dusan | | Troicki, Viktor |
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| Slovensko (1) |
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| Lacko, Lukas |
| | Slovinsko (2) |
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| Bedene, Aljaz | | Kavcic, Blaz |
| | Jihoafrická republika (1) |
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| Anderson, Kevin |
| | Jižní Korea (2) |
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| Chung, Hyeon | | Kwon, Soonwo |
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| Španělsko (9) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | | Švýcarsko (2) |
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| Federer, Roger | | Wawrinka, Stan |
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| Ukrajina (1) |
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| Dolgopolov, Alexandr |
| | Velká Británie (1) |
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| Edmund, Kyle |
| | USA (13) |
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| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | King, Kevin | | Kudla, Denis | | McDonald, Mackenzie | | Querrey, Sam | | Sandgren, Tennys | | Smyczek, Tim | | Sock, Jack | | Tiafoe, Frances | | Young, Donald |
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| Uzbekistán (1) |
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| Istomin, Denis |
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