| Argentina (1) |
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| Delbonis, Federico |
| | Australia (1) |
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| Tomljanovic, Ajla |
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| Azarenka, Victoria |
| | Canada (1) |
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| Fernandez, Leylah |
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| Czech Republic (1) |
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| Siniakova, Katerina |
| | | Greece (1) |
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| Tsitsipas, Stefanos |
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| Fucsovics, Marton |
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| Fognini, Fabio | | Trevisan, Martina |
| | | Netherlands (1) |
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| Zandschulp, Botic van de |
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| Cirstea, Sorana |
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| Russia (5) |
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| Kasatkina, Daria | | Khachanov, Karen | | Kudermetova, Veronika | | Medvedev, Daniil | | Pavlyuchenkova, Anastasia |
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| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip |
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| Andujar, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Munar, Jaume |
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| Bencic, Belinda |
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| United States (4) |
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| Isner, John | | Keys, Madison | | Opelka, Reilly | | Paul, Tommy |
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