| Australia (1) |
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| Millman, John |
| | Austria (1) |
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| Thiem, Dominic |
| | | Brasile (1) |
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| Monteiro, Thiago |
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| Cile (2) |
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| Garin, Christian | | Tabilo, Alejandro |
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| Lehecka, Jiri |
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| Rune, Holger |
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| Gasquet, Richard |
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| Cecchinato, Marco | | Fognini, Fabio |
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| Kukushkin, Mikhail |
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| Sousa, Joao |
| | Russia (4) |
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| Karatsev, Aslan | | Khachanov, Karen | | Rublev, Andrey | | Safiullin, Roman |
| | Serbia (6) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan | | Medjedovic, Hamad |
| | Slovenia (1) |
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| Bedene, Aljaz |
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| Laaksonen, Henri |
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