| Argentina (4) |
|---|
| Baez, Sebastian | | Cerundolo, Francisco | | Delbonis, Federico | | Schwartzman, Diego |
| | Australia (1) |
|---|
| De Minaur, Alex |
| | Austria (1) |
|---|
| Thiem, Dominic |
| |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (2) |
|---|
| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Chile (1) |
|---|
| Garin, Christian |
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| Croatia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
| | Finland (1) |
|---|
| Ruusuvuori, Emil |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (1) |
|---|
| Zverev, Alexander |
|
| Greece (1) |
|---|
| Tsitsipas, Stefanos |
| | Italy (8) |
|---|
| Arnaldi, Matteo | | Cobolli, Flavio | | Fognini, Fabio | | Nardi, Luca | | Passaro, Francesco | | Sinner, Jannik | | Sonego, Lorenzo | | Zeppieri, Giulio |
| | Kazakhstan (1) |
|---|
| Bublik, Alexander |
| | Netherlands (2) |
|---|
| Griekspoor, Tallon | | Zandschulp, Botic van de |
|
| | Poland (1) |
|---|
| Hurkacz, Hubert |
| | Russia (3) |
|---|
| Karatsev, Aslan | | Khachanov, Karen | | Rublev, Andrey |
| | Serbia (5) |
|---|
| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
|
| South Africa (1) |
|---|
| Harris, Lloyd |
| | Spain (5) |
|---|
| Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Nadal, Rafael | | Ramos-Vinolas, Albert |
| | Switzerland (1) |
|---|
| Wawrinka, Stan |
| | United Kingdom (2) |
|---|
| Evans, Daniel | | Norrie, Cameron |
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| United States (8) |
|---|
| Brooksby, Jenson | | Giron, Marcos | | Isner, John | | Korda, Sebastian | | Nakashima, Brandon | | Opelka, Reilly | | Paul, Tommy | | Tiafoe, Frances |
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