Argentina (3) |
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Del Potro, Juan Martin | Pella, Guido | Schwartzman, Diego |
| Austrálie (3) |
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De Minaur, Alex | Kyrgios, Nick | Millman, John |
| Rakousko (1) |
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Thiem, Dominic |
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| Bulharsko (1) |
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Dimitrov, Grigor |
| Kanada (2) |
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Auger-Aliassime, Felix | Shapovalov, Denis |
| Chorvatsko (2) |
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Cilic, Marin | Coric, Borna |
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Francie (7) |
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Chardy, Jeremy | Gasquet, Richard | Herbert, Pierre-Hugues | Mannarino, Adrian | Monfils, Gael | Pouille, Lucas | Simon, Gilles |
| Gruzie (1) |
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Basilashvili, Nikoloz |
| Německo (3) |
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Kohlschreiber, Philipp | Struff, Jan-Lennard | Zverev, Alexander |
| Řecko (1) |
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Tsitsipas, Stefano |
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Maďarsko (1) |
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Fucsovics, Marton |
| Itálie (3) |
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Cecchinato, Marco | Fognini, Fabio | Seppi, Andreas |
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Nishikori, Kei |
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Kukushkin, Mikhail |
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Hurkacz, Hubert |
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Sousa, Joao |
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Khachanov, Karen | Medvedev, Daniil |
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Srbsko (3) |
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Djere, Laslo | Djokovic, Novak | Lajovic, Dusan |
| Slovensko (1) |
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Klizan, Martin |
| Španělsko (8) |
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Bautista Agut, Roberto | Carreno Busta, Pablo | Davidovich Fokina, Alejandro | Ferrer, David | Munar, Jaume | Nadal, Rafael | Ramos-Vinolas, Albert | Verdasco, Fernando |
| Švýcarsko (2) |
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Federer, Roger | Wawrinka, Stan |
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Velká Británie (1) |
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Edmund, Kyle |
| USA (4) |
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Fritz, Taylor | Johnson, Steve | Opelka, Reilly | Tiafoe, Frances |
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