| Argentina (4) |
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| Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Schwartzman, Diego |
| | Austria (1) |
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| Thiem, Dominic |
| | | Bosnia y Herzegovina (1) |
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| Dzumhur, Damir |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | Canadá (1) |
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| Shapovalov, Denis |
| | | Croacia (2) |
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| Cilic, Marin | | Coric, Borna |
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| República Checa (1) |
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| Berdych, Tomas |
| | Francia (5) |
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| Gasquet, Richard | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
| | Alemania (3) |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Zverev, Alexander |
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| Grecia (1) |
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| Tsitsipas, Stefano |
| | Italia (6) |
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| Baldi, Filippo | | Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sonego, Lorenzo |
| | Japón (2) |
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| Nishikori, Kei | | Sugita, Yuichi |
| | Luxemburgo (1) |
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| Muller, Gilles |
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| Países Bajos (1) |
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| Haase, Robin |
| | Rusia (2) |
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| Khachanov, Karen | | Medvedev, Daniil |
| | Serbia (1) |
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| Djokovic, Novak |
| | Eslovenia (1) |
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| Bedene, Aljaz |
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| Sudáfrica (1) |
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| Anderson, Kevin |
| | España (6) |
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| Carreno Busta, Pablo | | Ferrer, David | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | |
| Ucrania (1) |
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| Dolgopolov, Alexandr |
| | Reino Unido (1) |
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| Edmund, Kyle |
| | Estados Unidos (7) |
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| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Querrey, Sam | | Sock, Jack | | Tiafoe, Frances |
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