| Argentina (7) |
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| Andreozzi, Guido | | Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego | | Zeballos, Horacio |
| | Austrália (10) |
|---|
| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Smith, John-Patrick | | Thompson, Jordan | | Tomic, Bernard |
| | Áustria (2) |
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| Novak, Dennis | | Thiem, Dominic |
| | Bélgica (2) |
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| Bemelmans, Ruben | | Goffin, David |
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| Bósnia Herzegovina (2) |
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| Basic, Mirza | | Dzumhur, Damir |
| | Bulgária (1) |
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| Dimitrov, Grigor |
| | Canadá (4) |
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| Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis |
| | Chile (2) |
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| Garin, Christian | | Jarry, Nicolas |
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| Croácia (3) |
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| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Chipre (1) |
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| Baghdatis, Marcos |
| | República Checa (1) |
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| Vesely, Jiri |
| | França (12) |
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| Barrere, Gregoire | | Benneteau, Julien | | Bonzi, Benjamin | | Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Robert, Stephane | | Simon, Gilles |
|
| Geórgia (1) |
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| Basilashvili, Nikoloz |
| | Alemanha (8) |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Maden, Yannick | | Marterer, Maximilian | | Mayer, Florian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grécia (1) |
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| Tsitsipas, Stefano |
| | Hungria (1) |
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| Fucsovics, Marton |
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| | | Itália (9) |
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| Berrettini, Matteo | | Bolelli, Simone | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Lorenzi, Paolo | | Seppi, Andreas | | Sonego, Lorenzo | | Travaglia, Stefano |
| | Japão (4) |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
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| Cazaquistão (1) |
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| Kukushkin, Mikhail |
| | Letónia (1) |
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| Gulbis, Ernests |
| | Lituânia (1) |
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| Berankis, Ricardas |
| | Luxemburgo (1) |
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| Muller, Gilles |
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| | | Polónia (1) |
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| Hurkacz, Hubert |
| | Portugal (2) |
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| Elias, Gastao | | Sousa, Joao |
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| | Rússia (4) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Youzhny, Mikhail |
| | Sérvia (4) |
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| Djere, Laslo | | Djokovic, Novak | | Krajinovic, Filip | | Lajovic, Dusan |
| | Eslováquia (2) |
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| Gombos, Norbert | | Lacko, Lukas |
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| Eslovénia (1) |
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| Bedene, Aljaz |
| | África do Sul (1) |
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| Anderson, Kevin |
| | Espanha (8) |
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| Carballes Baena, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Suíça (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
|
| | | Ucrânia (1) |
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| Stakhovsky, Sergiy |
| | Reino Unido (4) |
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| Broady, Liam | | Clarke, Jay | | Edmund, Kyle | | Norrie, Cameron |
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| Estados Unidos (14) |
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| Donaldson, Jared | | Fritz, Taylor | | Harrison, Christian | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | McDonald, Mackenzie | | Mmoh, Michael | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
| | | Uzbequistão (1) |
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| Istomin, Denis |
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