| Argentina (1) |
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| Schwartzman, Diego |
| | Bulgarien (1) |
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| Dimitrov, Grigor |
| | Canada (2) |
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| Auger-Aliassime, Felix | | Raonic, Milos |
| | Colombia (1) |
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| Galan, Daniel Elahi |
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| | Frankrig (2) |
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| Mannarino, Adrian | | Paire, Benoit |
| | Tyskland (2) |
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| Koepfer, Dominik | | Zverev, Alexander |
| | Grækenland (1) |
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| Tsitsipas, Stefano |
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| Italien (5) |
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| Caruso, Salvatore | | Fognini, Fabio | | Gaio, Federico | | Musetti, Lorenzo | | Travaglia, Stefano |
| | Mexico (1) |
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| Lopez Villasenor, Gerardo |
| | Holland (2) |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
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| Portugal (1) |
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| Ferreira Silva, Frederico |
| | Serbien (2) |
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| Djere, Laslo | | Kecmanovic, Miomir |
| | Spanien (2) |
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| Alcaraz, Carlos | | Lopez, Feliciano |
| | Storbritannien (1) |
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| Norrie, Cameron |
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| USA (9) |
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| Isner, John | | Johnson, Steve | | Korda, Sebastian | | Kozlov, Stefan | | Kudla, Denis | | Nakashima, Brandon | | Paul, Tommy | | Sandgren, Tennys | | Tiafoe, Frances |
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