| Argentinië (4) |
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| Baez, Sebastian | | Cerundolo, Francisco | | Delbonis, Federico | | Schwartzman, Diego |
| | Australië (1) |
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| De Minaur, Alex |
| | Oostenrijk (1) |
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| Thiem, Dominic |
| | Wit-Rusland (1) |
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| Ivashka, Ilya |
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| | Bulgarije (1) |
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| Dimitrov, Grigor |
| | Canada (2) |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
| | Chili (1) |
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| Garin, Christian |
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| Kroatië (2) |
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| Cilic, Marin | | Coric, Borna |
| | Finland (1) |
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| Ruusuvuori, Emil |
| | Georgië (1) |
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| Basilashvili, Nikoloz |
| | Duitsland (1) |
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| Zverev, Alexander |
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| Griekenland (1) |
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| Tsitsipas, Stefanos |
| | Italië (8) |
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| Arnaldi, Matteo | | Cobolli, Flavio | | Fognini, Fabio | | Nardi, Luca | | Passaro, Francesco | | Sinner, Jannik | | Sonego, Lorenzo | | Zeppieri, Giulio |
| | Kazachstan (1) |
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| Bublik, Alexander |
| | Nederland (2) |
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| Griekspoor, Tallon | | Zandschulp, Botic van de |
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| Noorwegen (1) |
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| Ruud, Casper |
| | | Rusland (3) |
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| Karatsev, Aslan | | Khachanov, Karen | | Rublev, Andrey |
| | Servië (5) |
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| Djere, Laslo | | Djokovic, Novak | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Zuid-Afrika (1) |
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| Harris, Lloyd |
| | Spanje (5) |
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| Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Nadal, Rafael | | Ramos-Vinolas, Albert |
| | Zwitserland (1) |
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| Wawrinka, Stan |
| | Verenigd Koninkrijk (2) |
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| Evans, Daniel | | Norrie, Cameron |
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| Verenigde Staten (8) |
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| Brooksby, Jenson | | Giron, Marcos | | Isner, John | | Korda, Sebastian | | Nakashima, Brandon | | Opelka, Reilly | | Paul, Tommy | | Tiafoe, Frances |
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