| Argentina (1) |
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| Pella, Guido |
| | Australia (2) |
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| Ebden, Matthew | | Millman, John |
| | | Bosnia-Herzegovina (1) |
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| Dzumhur, Damir |
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| | France (5) |
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| Gasquet, Richard | | Herbert, Pierre-Hugues | | Monfils, Gael | | Paire, Benoit | | Tsonga, Jo-Wilfried |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
| | Germany (6) |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Molleker, Rudolf | | Moraing, Mats | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Italy (2) |
|---|
| Berrettini, Matteo | | Seppi, Andreas |
| | | Netherlands (1) |
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| Haase, Robin |
| | Poland (1) |
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| Hurkacz, Hubert |
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| | Russia (1) |
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| Khachanov, Karen |
| | Serbia (2) |
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| Djere, Laslo | | Kecmanovic, Miomir |
| | Spain (2) |
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| Bautista Agut, Roberto | | Munar, Jaume |
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| Switzerland (1) |
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| Federer, Roger |
| | Ukraine (1) |
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| Stakhovsky, Sergiy |
| | United States (2) |
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| Fritz, Taylor | | Johnson, Steve |
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