| Argentinië (1) |
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| Mayer, Leonardo |
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| Millman, John |
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| Monteiro, Thiago |
| | Canada (2) |
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| Pospisil, Vasek | | Shapovalov, Denis |
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| Humbert, Ugo | | Mannarino, Adrian | | Paire, Benoit |
| | Italië (5) |
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| Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sinner, Jannik | | Sonego, Lorenzo |
| | | Nieuw-Zeeland (1) |
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| Venus, Michael |
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| Ruud, Casper |
| | | | Rusland (1) |
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| Khachanov, Karen |
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| Andujar, Pablo | | Davidovich Fokina, Alejandro | | Lopez, Feliciano |
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| Edmund, Kyle | | Norrie, Cameron |
| | Verenigde Staten (4) |
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| Isner, John | | Mmoh, Michael | | Sandgren, Tennys | | Tiafoe, Frances |
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