| Argentina (2) |
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| Mayer, Leonardo | | Pella, Guido |
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| Popyrin, Alexei |
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| Karlovic, Ivo |
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| Chardy, Jeremy | | Paire, Benoit |
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| Fabbiano, Thomas | | Seppi, Andreas |
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| Haase, Robin |
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| Edmund, Kyle | | Watson, Heather |
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| USA (3) |
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| Collins, Danielle | | Gauff, Cori | | Kenin, Sofia |
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