| 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-Erzegovina (1) |
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| Dzumhur, Damir |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
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| Shapovalov, Denis |
| | | Croazia (2) |
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| Cilic, Marin | | Coric, Borna |
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| Repubblica Ceca (1) |
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| Berdych, Tomas |
| | Francia (5) |
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| Gasquet, Richard | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas |
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| Basilashvili, Nikoloz |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Zverev, Alexander |
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| Tsitsipas, Stefano |
| | Italia (6) |
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| Baldi, Filippo | | Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sonego, Lorenzo |
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| Muller, Gilles |
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| Khachanov, Karen | | Medvedev, Daniil |
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| Djokovic, Novak |
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| Bedene, Aljaz |
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| Anderson, Kevin |
| | Spagna (6) |
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| Carreno Busta, Pablo | | Ferrer, David | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
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| Wawrinka, Stan |
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| Dolgopolov, Alexandr |
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| Edmund, Kyle |
| | Stati Uniti (7) |
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| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Querrey, Sam | | Sock, Jack | | Tiafoe, Frances |
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