| Argentina (1) |
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| Mayer, Leonardo |
| | Australia (2) |
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| Kyrgios, Nick | | Millman, John |
| | | Bosnia and Herzegovina (1) |
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| Dzumhur, Damir |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | Canada (2) |
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| Raonic, Milos | | Shapovalov, Denis |
| | | Czech Republic (1) |
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| Berdych, Tomas |
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| France (3) |
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| Benneteau, Julien | | Chardy, Jeremy | | Mannarino, Adrian |
| | | Luxembourg (1) |
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| Muller, Gilles |
| | Russia (1) |
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| Medvedev, Daniil |
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| Serbia (1) |
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| Djokovic, Novak |
| | South Africa (1) |
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| Anderson, Kevin |
| | Spain (2) |
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| Lopez, Feliciano | | Verdasco, Fernando |
| |
| United Kingdom (5) |
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| Clarke, Jay | | Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | United States (6) |
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| Donaldson, Jared | | Harrison, Ryan | | Querrey, Sam | | Smyczek, Tim | | Sock, Jack | | Tiafoe, Frances |
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