| Argentina (4) |
|---|
| Bagnis, Facundo | | Coria, Federico | | Pella, Guido | | Schwartzman, Diego |
| | Australia (2) |
|---|
| De Minaur, Alex | | Millman, John |
| | | Bulgaria (1) |
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| Dimitrov, Grigor |
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| Canada (3) |
|---|
| Auger-Aliassime, Felix | | Raonic, Milos | | Shapovalov, Denis |
| | | Croazia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
| | Francia (4) |
|---|
| Humbert, Ugo | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit |
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| Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germania (2) |
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| Koepfer, Dominik | | Struff, Jan-Lennard |
| | Grecia (1) |
|---|
| Tsitsipas, Stefano |
| | Italia (9) |
|---|
| Berrettini, Matteo | | Caruso, Salvatore | | Cecchinato, Marco | | Fognini, Fabio | | Mager, Gianluca | | Musetti, Lorenzo | | Sinner, Jannik | | Sonego, Lorenzo | | Travaglia, Stefano |
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| Giappone (2) |
|---|
| Nishikori, Kei | | Nishioka, Yoshihito |
| | Kazakistan (1) |
|---|
| Bublik, Alexander |
| | | Polonia (1) |
|---|
| Hurkacz, Hubert |
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| Portogallo (1) |
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| Sousa, Joao |
| | Russia (2) |
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| Khachanov, Karen | | Rublev, Andrey |
| | Serbia (4) |
|---|
| Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
| | Sud Africa (1) |
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| Anderson, Kevin |
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| Spagna (5) |
|---|
| Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Nadal, Rafael | | Ramos-Vinolas, Albert |
| | Svizzera (1) |
|---|
| Wawrinka, Stan |
| | Regno Unito (2) |
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| Edmund, Kyle | | Evans, Daniel |
| | Stati Uniti (3) |
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| Fritz, Taylor | | Querrey, Sam | | Sandgren, Tennys |
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