| Argentinië (4) |
|---|
| Delbonis, Federico | | Mayer, Leonardo | | Pella, Guido | | Schwartzman, Diego |
| | Oostenrijk (2) |
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| Haider-Maurer, Andreas | | Thiem, Dominic |
| | Wit-Rusland (1) |
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| Ivashka, Ilya |
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| Brazilië (1) |
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| Dutra Silva, Rogerio |
| | Bulgarije (1) |
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| Dimitrov, Grigor |
| | |
| Frankrijk (4) |
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| Mannarino, Adrian | | Moutet, Corentin | | Paire, Benoit | | Simon, Gilles |
| | Duitsland (2) |
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| Gojowczyk, Peter | | Zverev, Mischa |
| | Griekenland (1) |
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| Tsitsipas, Stefano |
| | Japan (2) |
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| Nishikori, Kei | | Sugita, Yuichi |
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| Kazachstan (1) |
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| Kukushkin, Mikhail |
| | Mexico (1) |
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| Escobedo, Ernesto |
| | | Rusland (3) |
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| Khachanov, Karen | | Rublev, Andrey | | Vatutin, Alexey |
|
| Servië (2) |
|---|
| Djokovic, Novak | | Lajovic, Dusan |
| | Slowakije (2) |
|---|
| Klizan, Martin | | Kovalik, Jozef |
| | Zuid-Korea (1) |
|---|
| Chung, Hyeon |
| | Spanje (14) |
|---|
| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Garcia-Lopez, Guillermo | | Granollers, Marcel | | Lopez, Feliciano | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ojeda Lara, Ricardo | | Ramos-Vinolas, Albert | | Robredo, Tommy | | Verdasco, Fernando |
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| | Verenigde Staten (3) |
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| Donaldson, Jared | | Fratangelo, Bjorn | | Sandgren, Tennys |
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