| Argentina (1) |
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| Mayer, Leonardo |
| | Australia (3) |
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| Ebden, Matthew | | Millman, John | | Popyrin, Alexei |
| | Canadá (1) |
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| Shapovalov, Denis |
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| | Francia (3) |
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| Chardy, Jeremy | | Mannarino, Adrian | | Simon, Gilles |
| | Alemania (4) |
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| Gojowczyk, Peter | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Grecia (1) |
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| Tsitsipas, Stefano |
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| Italia (2) |
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| Cecchinato, Marco | | Seppi, Andreas |
| | | Letonia (1) |
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| Gulbis, Ernests |
| | Países Bajos (1) |
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| Haase, Robin |
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| | | Rusia (1) |
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| Medvedev, Daniil |
| | Serbia (3) |
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| Djere, Laslo | | Krajinovic, Filip | | Lajovic, Dusan |
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| España (1) |
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| Bautista Agut, Roberto |
| | Suiza (3) |
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| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| | Estados Unidos (3) |
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| Fritz, Taylor | | Harrison, Ryan | | Sock, Jack |
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