| Argentina (5) |
|---|
| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australien (12) |
|---|
| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Ebden, Matthew | | Kokkinakis, Thanasi | | Kubler, Jason | | Kyrgios, Nick | | Millman, John | | Polmans, Marc | | Popyrin, Alexei | | Thompson, Jordan | | Tomic, Bernard |
| | | Hviderusland (1) |
|---|
| Ivashka, Ilya |
|
| Belgien (2) |
|---|
| Darcis, Steve | | Goffin, David |
| | Bosnien og Herzegovina (2) |
|---|
| Basic, Mirza | | Dzumhur, Damir |
| | Bulgarien (1) |
|---|
| Dimitrov, Grigor |
| | Canada (2) |
|---|
| Raonic, Milos | | Shapovalov, Denis |
|
| Chile (2) |
|---|
| Garin, Christian | | Jarry, Nicolas |
| | | Kroatien (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Tjekkiet (2) |
|---|
| Berdych, Tomas | | Vesely, Jiri |
|
| Frankrig (10) |
|---|
| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Sakharov, Gleb | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Georgien (1) |
|---|
| Basilashvili, Nikoloz |
| | Tyskland (7) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Molleker, Rudolf | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grækenland (1) |
|---|
| Tsitsipas, Stefano |
|
| Ungarn (1) |
|---|
| Fucsovics, Marton |
| | Indien (1) |
|---|
| Gunneswaran, Prajnesh |
| | Italien (7) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Seppi, Andreas | | Travaglia, Stefano | | Vanni, Luca |
| | Japan (4) |
|---|
| Daniel, Taro | | Ito, Tatsuma | | Nishikori, Kei | | Nishioka, Yoshihito |
|
| Kasakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Letland (1) |
|---|
| Gulbis, Ernests |
| | |
| Polen (2) |
|---|
| Hurkacz, Hubert | | Majchrzak, Kamil |
| | Portugal (2) |
|---|
| Sousa, Joao | | Sousa, Pedro |
| | Rumænien (1) |
|---|
| Copil, Marius |
| | Rusland (4) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
|
| Serbien (7) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko | | Troicki, Viktor |
| | Slovakiet (1) |
|---|
| Klizan, Martin |
| | Slovenien (1) |
|---|
| Bedene, Aljaz |
| | Sydafrika (2) |
|---|
| Anderson, Kevin | | Harris, Lloyd |
|
| | Spanien (11) |
|---|
| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Garcia-Lopez, Guillermo | | Granollers, Marcel | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Schweizisk (3) |
|---|
| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| | Tunesien (1) |
|---|
| Jaziri, Malek |
|
| Storbritannien (4) |
|---|
| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | USA (16) |
|---|
| Eubanks, Christopher | | Fratangelo, Bjorn | | Fritz, Taylor | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Krueger, Mitchell | | Kudla, Denis | | McDonald, Mackenzie | | Mmoh, Michael | | Opelka, Reilly | | Querrey, Sam | | Sandgren, Tennys | | Sock, Jack | | Tiafoe, Frances |
| | | Usbekistan (1) |
|---|
| Istomin, Denis |
|