| Argentina (5) |
|---|
| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (7) |
|---|
| Bolt, Alex | | De Minaur, Alex | | Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Popyrin, Alexei | | Thompson, Jordan |
| | Austria (1) |
|---|
| Thiem, Dominic |
| |
| | Bosnia and Herzegovina (1) |
|---|
| Dzumhur, Damir |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (3) |
|---|
| Auger-Aliassime, Felix | | Raonic, Milos | | Shapovalov, Denis |
|
| | Croatia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Czech Republic (1) |
|---|
| Berdych, Tomas |
| | France (8) |
|---|
| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
|
| Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (6) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Hungary (1) |
|---|
| Fucsovics, Marton |
|
| India (1) |
|---|
| Gunneswaran, Prajnesh |
| | Italy (4) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas |
| | Japan (4) |
|---|
| Daniel, Taro | | Ito, Tatsuma | | Nishikori, Kei | | Nishioka, Yoshihito |
| | Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
|
| Latvia (1) |
|---|
| Gulbis, Ernests |
| | Lithuania (1) |
|---|
| Berankis, Ricardas |
| | | Netherlands (1) |
|---|
| Haase, Robin |
|
| Poland (1) |
|---|
| Hurkacz, Hubert |
| | | | Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
|
| Serbia (5) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Slovakia (1) |
|---|
| Klizan, Martin |
| | South Africa (1) |
|---|
| Anderson, Kevin |
| | Spain (7) |
|---|
| Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Lopez, Feliciano | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert |
|
| | Swiss (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
| | | United Kingdom (3) |
|---|
| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
|
| United States (15) |
|---|
| Donaldson, Jared | | Fratangelo, Bjorn | | Fritz, Taylor | | Giron, Marcos | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | McDonald, Mackenzie | | Opelka, Reilly | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances | | Young, Donald |
| | Uzbekistan (1) |
|---|
| Istomin, Denis |
|