| Argentina (5) |
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| Andreozzi, Guido | | Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Australia (5) |
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| Ebden, Matthew | | Kyrgios, Nick | | Millman, John | | Thompson, Jordan | | Tomic, Bernard |
| | Austria (1) |
|---|
| Thiem, Dominic |
| |
| | Bosnia and Herzegovina (1) |
|---|
| Dzumhur, Damir |
| | Brasil (1) |
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| Monteiro, Thiago |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Canada (3) |
|---|
| Auger-Aliassime, Felix | | Raonic, Milos | | Shapovalov, Denis |
| | | Croatia (3) |
|---|
| Cilic, Marin | | Coric, Borna | | Karlovic, Ivo |
| | Czech Republic (1) |
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| Berdych, Tomas |
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| 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 | | Kuhn, Nicola | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Greece (1) |
|---|
| Tsitsipas, Stefano |
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| Hungary (1) |
|---|
| Fucsovics, Marton |
| | India (1) |
|---|
| Gunneswaran, Prajnesh |
| | Italy (5) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Fabbiano, Thomas | | Fognini, Fabio | | Sonego, Lorenzo |
| | Japan (2) |
|---|
| Daniel, Taro | | Nishikori, Kei |
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| Kazakhstan (2) |
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| Bublik, Alexander | | Kukushkin, Mikhail |
| | Latvia (1) |
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| Gulbis, Ernests |
| | | Netherlands (1) |
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| Haase, Robin |
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| | Poland (1) |
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| Hurkacz, Hubert |
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| Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
| | Serbia (5) |
|---|
| Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Tipsarevic, Janko |
| | Slovakia (2) |
|---|
| Klizan, Martin | | Lacko, Lukas |
| | Slovenia (1) |
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| Bedene, Aljaz |
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| South Africa (2) |
|---|
| Anderson, Kevin | | Harris, Lloyd |
| | Spain (7) |
|---|
| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Ferrer, David | | Lopez, Feliciano | | Munar, Jaume | | Ramos-Vinolas, Albert |
| | | Swiss (2) |
|---|
| Federer, Roger | | Wawrinka, Stan |
|
| Taiwan (1) |
|---|
| Tseng, Chun-Hsin |
| | | United Kingdom (3) |
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| Edmund, Kyle | | Evans, Daniel | | Norrie, Cameron |
| | United States (11) |
|---|
| Eubanks, Christopher | | Fritz, Taylor | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | Kudla, Denis | | McDonald, Mackenzie | | Opelka, Reilly | | Querrey, Sam | | Sandgren, Tennys | | Tiafoe, Frances |
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