| Argentina (2) |
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| Del Potro, Juan Martin | | Mayer, Leonardo |
| | Bélgica (2) |
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| Bemelmans, Ruben | | Goffin, David |
| | Canadá (2) |
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| Pospisil, Vasek | | Shapovalov, Denis |
| | Croacia (2) |
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| Cilic, Marin | | Coric, Borna |
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| Francia (3) |
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| Benneteau, Julien | | Mannarino, Adrian | | Paire, Benoit |
| | Alemania (3) |
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| Gojowczyk, Peter | | Mayer, Florian | | Zverev, Mischa |
| | Hungría (1) |
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| Fucsovics, Marton |
| |
| | Kazajstán (1) |
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| Kukushkin, Mikhail |
| | Países Bajos (1) |
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| Haase, Robin |
| |
| Corea del Sur (1) |
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| Chung, Hyeon |
| | España (2) |
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| Bautista Agut, Roberto | | Verdasco, Fernando |
| | Suiza (3) |
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| Chiudinelli, Marco | | Federer, Roger | | Laaksonen, Henri |
| | Ucrania (1) |
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| Dolgopolov, Alexandr |
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| Estados Unidos (6) |
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| Donaldson, Jared | | Harrison, Ryan | | Johnson, Steve | | Sock, Jack | | Tiafoe, Frances | | Young, Donald |
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