| Argentina (1) |
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| Pella, Guido |
| | Australia (2) |
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| Kyrgios, Nick | | Millman, John |
| | Bosnia-Herzegovina (1) |
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| Basic, Mirza |
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| Raonic, Milos | | Shapovalov, Denis |
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| Galovic, Viktor |
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| Paire, Benoit | | Pouille, Lucas | | Simon, Gilles |
| | Germany (7) |
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| Kohlschreiber, Philipp | | Maden, Yannick | | Marterer, Maximilian | | Mayer, Florian | | Molleker, Rudolf | | Struff, Jan-Lennard | | Zverev, Mischa |
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| Federer, Roger |
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| Istomin, Denis |
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