| Argentinien (2) |
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| Del Potro, Juan Martin | | Schwartzman, Diego |
| | Australien (4) |
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| Barty, Ashleigh | | Ebden, Matthew | | Gavrilova, Daria | | Kyrgios, Nick |
| | Österreich (1) |
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| Thiem, Dominic |
| | Weißrussland (3) |
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| Azarenka, Victoria | | Ivashka, Ilya | | Sabalenka, Aryna |
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| Belgien (4) |
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| Flipkens, Kirsten | | Goffin, David | | Mertens, Elise | | Uytvanck, Alison Van |
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| Basic, Mirza | | Dzumhur, Damir |
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| Dimitrov, Grigor | | Karatantcheva, Sesil |
| | Kanada (8) |
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| Abanda, Francoise | | Auger-Aliassime, Felix | | Bouchard, Eugenie | | Polansky, Peter | | Pospisil, Vasek | | Raonic, Milos | | Shapovalov, Denis | | Zhao, Carol |
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| China (2) |
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| Wang, Qiang | | Zhang, Shuai |
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| Cilic, Marin | | Coric, Borna |
| | Tschechien (6) |
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| Krejcikova, Barbora | | Kvitova, Petra | | Pliskova, Karolina | | Safarova, Lucie | | Siniakova, Katerina | | Strycova, Barbora |
| | Dänemark (1) |
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| Wozniacki, Caroline |
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| Estland (1) |
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| Kontaveit, Anett |
| | Frankreich (8) |
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| Chardy, Jeremy | | Cornet, Alizé | | Garcia, Caroline | | Herbert, Pierre-Hugues | | Mannarino, Adrian | | Mladenovic, Kristina | | Paire, Benoit | | Pouille, Lucas |
| | Deutschland (5) |
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| Goerges, Julia | | Gojowczyk, Peter | | Kerber, Angelique | | Maria, Tatjana | | Zverev, Alexander |
| | Griechenland (2) |
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| Sakkari, Maria | | Tsitsipas, Stefano |
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| Ungarn (2) |
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| Babos, Timea | | Fucsovics, Marton |
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| Cecchinato, Marco | | Fognini, Fabio |
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| Nishikori, Kei | | Nishioka, Yoshihito | | Osaka, Naomi | | Sugita, Yuichi |
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| Ostapenko, Jelena | | Sevastova, Anastasija |
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| Die Niederlande (2) |
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| Bertens, Kiki | | Haase, Robin |
| | | Puerto Rico (1) |
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| Puig, Monica |
| | Rumänien (6) |
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| Begu, Irina-Camelia | | Bogdan, Ana | | Buzarnescu, Mihaela | | Cirstea, Sorana | | Halep, Simona | | Niculescu, Monica |
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| Russland (10) |
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| Donskoy, Evgeny | | Kasatkina, Daria | | Khachanov, Karen | | Makarova, Ekaterina | | Medvedev, Daniil | | Pavlyuchenkova, Anastasia | | Rublev, Andrey | | Sharapova, Maria | | Youzhny, Mikhail | | Zhuk, Sofya |
| | Serbien (3) |
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| Djokovic, Novak | | Krajinovic, Filip | | Krunic, Aleksandra |
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| Rybarikova, Magdalena |
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| Anderson, Kevin |
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| | Spanien (8) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Muguruza, Garbiñe | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Suárez Navarro, Carla | | Verdasco, Fernando |
| | Schweiz (1) |
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| Wawrinka, Stan |
| | Ukraine (2) |
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| Svitolina, Elina | | Tsurenko, Lesia |
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| Groß Britannien (3) |
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| Boulter, Katie | | Edmund, Kyle | | Konta, Johanna |
| | Vereinigte Staaten (13) |
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| Dolehide, Caroline | | Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Klahn, Bradley | | McDonald, Mackenzie | | McHale, Christina | | Querrey, Sam | | Sock, Jack | | Stephens, Sloane | | Tiafoe, Frances | | Williams, Venus |
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