| Argentina (3) |
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| Baez, Sebastian | | Cerundolo, Francisco | | Etcheverry, Tomas Martin |
| | Austrálie (1) |
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| Duckworth, James |
| | | Kanada (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Chile (2) |
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| Jarry, Nicolas | | Tabilo, Alejandro |
| | | Chorvatsko (1) |
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| Cilic, Marin |
| | Česká republika (1) |
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| Lehecka, Jiri |
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| | Francie (4) |
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| Fils, Arthur | | Humbert, Ugo | | Mannarino, Adrian | | Mpetshi Perricard, Giovanni |
| | Německo (1) |
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| Altmaier, Daniel |
| | Řecko (1) |
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| Tsitsipas, Stefanos |
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| Itálie (1) |
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| Arnaldi, Matteo |
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| Bublik, Alexander |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
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| Portugalsko (1) |
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| Borges, Nuno |
| | | Španělsko (2) |
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| Bautista Agut, Roberto | | Martinez, Pedro |
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| Kym, Jerome | | Stricker, Dominic | | Wawrinka, Stan |
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