| Argentina (1) |
|---|
| Cerundolo, Francisco |
| | Australia (2) |
|---|
| Popyrin, Alexei | | Vukic, Aleksandar |
| | Austria (3) |
|---|
| Misolic, Filip | | Ofner, Sebastian | | Thiem, Dominic |
| | Bulgaria (1) |
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| Dimitrov, Grigor |
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| | República Checa (2) |
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| Lehecka, Jiri | | Machac, Tomas |
| | Francia (3) |
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| Fils, Arthur | | Monfils, Gael | | Muller, Alexandre |
| | Alemania (2) |
|---|
| Altmaier, Daniel | | Zverev, Alexander |
|
| Grecia (1) |
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| Tsitsipas, Stefanos |
| | Italia (4) |
|---|
| Arnaldi, Matteo | | Musetti, Lorenzo | | Sinner, Jannik | | Sonego, Lorenzo |
| | Rusia (5) |
|---|
| Karatsev, Aslan | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Safiullin, Roman |
| | España (1) |
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| Ramos-Vinolas, Albert |
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| Reino Unido (2) |
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| Evans, Daniel | | Norrie, Cameron |
| | Estados Unidos (4) |
|---|
| Paul, Tommy | | Shelton, Ben | | Tiafoe, Frances | | Wolf, J.J. |
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