| Argentinië (1) |
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| Mayer, Leonardo |
| | Australië (3) |
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| Ebden, Matthew | | Millman, John | | Popyrin, Alexei |
| | Canada (1) |
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| Shapovalov, Denis |
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| | Frankrijk (3) |
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| Chardy, Jeremy | | Mannarino, Adrian | | Simon, Gilles |
| | Duitsland (4) |
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| Gojowczyk, Peter | | Marterer, Maximilian | | Struff, Jan-Lennard | | Zverev, Alexander |
| | Griekenland (1) |
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| Tsitsipas, Stefano |
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| Italië (2) |
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| Cecchinato, Marco | | Seppi, Andreas |
| | | Letland (1) |
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| Gulbis, Ernests |
| | Nederland (1) |
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| Haase, Robin |
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| | Roemenië (1) |
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| Copil, Marius |
| | Rusland (1) |
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| Medvedev, Daniil |
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| Djere, Laslo | | Krajinovic, Filip | | Lajovic, Dusan |
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| Spanje (1) |
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| Bautista Agut, Roberto |
| | Zwitserland (3) |
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| Federer, Roger | | Laaksonen, Henri | | Wawrinka, Stan |
| | Verenigde Staten (3) |
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| Fritz, Taylor | | Harrison, Ryan | | Sock, Jack |
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