| Argentina (4) |
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| Bagnis, Facundo | | Cerundolo, Francisco | | Coria, Federico | | Schwartzman, Diego |
| | Australia (4) |
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| Duckworth, James | | Millman, John | | Purcell, Max | | Saville, Luke |
| | Belarús (2) |
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| Gerasimov, Egor | | Ivashka, Ilya |
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| Brasil (2) |
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| Menezes, Joao | | Monteiro, Thiago |
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| Auger-Aliassime, Felix |
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| Barrios Vera, Marcelo Tomas |
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| Galan, Daniel Elahi |
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| Machac, Tomas |
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| Safwat, Mohamed |
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| Chardy, Jeremy | | Humbert, Ugo | | Monfils, Gael | | Simon, Gilles |
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| Georgia (1) |
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| Basilashvili, Nikoloz |
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| Koepfer, Dominik | | Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Fucsovics, Marton |
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| Fognini, Fabio | | Musetti, Lorenzo | | Sonego, Lorenzo |
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| Daniel, Taro | | Nishikori, Kei | | Nishioka, Yoshihito | | Sugita, Yuichi |
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| Varillas, Juan Pablo |
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| Sousa, Joao | | Sousa, Pedro |
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| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
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| Djokovic, Novak | | Kecmanovic, Miomir |
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| Andujar, Pablo | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro |
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| Broady, Liam | | Murray, Andy |
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| Giron, Marcos | | Paul, Tommy | | Sandgren, Tennys | | Tiafoe, Frances |
| | Uzbekistán (1) |
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| Istomin, Denis |
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