Argentina (2) |
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Mayer, Leonardo | Pella, Guido |
| Australia (1) |
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Tomic, Bernard |
| Austria (1) |
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Thiem, Dominic |
| Brazil (1) |
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Monteiro, Thiago |
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Canada (1) |
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Pospisil, Vasek |
| China (2) |
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Wu, Di | Wu, Yibing |
| Croatia (2) |
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Coric, Borna | Pavic, Mate |
| Cyprus (1) |
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Baghdatis, Marcos |
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Georgia (1) |
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Basilashvili, Nikoloz |
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Gojowczyk, Peter | Struff, Jan-Lennard |
| Greece (1) |
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Tsitsipas, Stefano |
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Russia (2) |
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Khachanov, Karen | Rublev, Andrey |
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Lajovic, Dusan | Troicki, Viktor |
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Menendez-Maceiras, Adrian | Ramos-Vinolas, Albert |
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Edmund, Kyle |
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Donaldson, Jared | Fritz, Taylor |
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Istomin, Denis |
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