| Argentina (8) |
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| Baez, Sebastian | | Bagnis, Facundo | | Cerundolo, Juan Manuel | | Coria, Federico | | Delbonis, Federico | | Etcheverry, Tomas Martin | | Schwartzman, Diego | | Trungelliti, Marco |
| | Austrália (10) |
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| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Kokkinakis, Thanasi | | Kyrgios, Nick | | Millman, John | | O'Connell, Christopher | | Popyrin, Alexei | | Thompson, Jordan | | Vukic, Aleksandar |
| | Bielorrússia (2) |
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| Gerasimov, Egor | | Ivashka, Ilya |
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| Bósnia Herzegovina (1) |
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| Dzumhur, Damir |
| | Brasil (1) |
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| Monteiro, Thiago |
| | Bulgária (1) |
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| Dimitrov, Grigor |
| | Canadá (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Chile (3) |
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| Barrios Vera, Tomas | | Garin, Christian | | Tabilo, Alejandro |
| | | República Checa (3) |
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| Lehecka, Jiri | | Machac, Tomas | | Vesely, Jiri |
| | Dinamarca (1) |
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| Rune, Holger |
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| | Finlândia (1) |
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| Ruusuvuori, Emil |
| | França (10) |
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| Bonzi, Benjamin | | Gasquet, Richard | | Gaston, Hugo | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Moutet, Corentin | | Paire, Benoit | | Pouille, Lucas | | Rinderknech, Arthur |
| | Geórgia (1) |
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| Basilashvili, Nikoloz |
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| Alemanha (9) |
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| Altmaier, Daniel | | Gojowczyk, Peter | | Hanfmann, Yannick | | Koepfer, Dominik | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Otte, Oscar | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grécia (1) |
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| Tsitsipas, Stefanos |
| | Hungria (1) |
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| Fucsovics, Marton |
| | Itália (10) |
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| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Mager, Gianluca | | Musetti, Lorenzo | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
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| Japão (2) |
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| Daniel, Taro | | Nishioka, Yoshihito |
| | Cazaquistão (3) |
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| Bublik, Alexander | | Kukushkin, Mikhail | | Skatov, Timofey |
| | Lituânia (1) |
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| Berankis, Ricardas |
| | México (1) |
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| Escobedo, Ernesto |
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| | Holanda (2) |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
| | | Polónia (2) |
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| Hurkacz, Hubert | | Majchrzak, Kamil |
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| | Rússia (5) |
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| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Safiullin, Roman |
| | Sérvia (5) |
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| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Milojevic, Nikola |
| | Eslováquia (2) |
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| Gombos, Norbert | | Molcan, Alex |
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| África do Sul (2) |
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| Anderson, Kevin | | Harris, Lloyd |
| | Coreia do Sul (1) |
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| Kwon, Soonwoo |
| | Espanha (12) |
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| Alcaraz, Carlos | | Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Lopez, Feliciano | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Taberner, Carlos |
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| Suíça (1) |
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| Laaksonen, Henri |
| | Taiwan (1) |
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| Tseng, Chun-Hsin |
| | Reino Unido (4) |
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| Broady, Liam | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Estados Unidos (14) |
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| Cressy, Maxime | | Fritz, Taylor | | Giron, Marcos | | Isner, John | | Johnson, Steve | | Korda, Sebastian | | Kozlov, Stefan | | Kudla, Denis | | McDonald, Mackenzie | | Nakashima, Brandon | | Opelka, Reilly | | Paul, Tommy | | Querrey, Sam | | Tiafoe, Frances |
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