Argentina (2) |
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Mayer, Leonardo | Pella, Guido |
| Australia (1) |
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Popyrin, Alexei |
| | |
| Czech Republic (1) |
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Pliskova, Karolina |
| Denmark (1) |
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Wozniacki, Caroline |
| Estonia (1) |
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Kontaveit, Anett |
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France (2) |
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Chardy, Jeremy | Paire, Benoit |
| Italy (2) |
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Fabbiano, Thomas | Seppi, Andreas |
| Latvia (1) |
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Sevastova, Anastasija |
| Netherlands (1) |
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Haase, Robin |
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Poland (1) |
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Hurkacz, Hubert |
| Puerto Rico (1) |
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Puig, Monica |
| Russia (4) |
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Gasparyan, Margarita | Khachanov, Karen | Kudermetova, Veronika | Medvedev, Daniil |
| Serbia (1) |
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Kecmanovic, Miomir |
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Slovakia (1) |
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Rybarikova, Magdalena |
| Spain (2) |
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Lopez, Feliciano | Verdasco, Fernando |
| Ukraine (2) |
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Svitolina, Elina | Yastremska, Dayana |
| United Kingdom (2) |
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Edmund, Kyle | Watson, Heather |
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United States (3) |
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Collins, Danielle | Gauff, Cori | Kenin, Sofia |
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