| Argentinië (2) |
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| Del Potro, Juan Martin | | Schwartzman, Diego |
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| Thiem, Dominic |
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| Dimitrov, Grigor |
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| Pospisil, Vasek | | Shapovalov, Denis |
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| Cilic, Marin | | Coric, Borna |
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| Benneteau, Julien | | Chardy, Jeremy | | Gasquet, Richard | | Herbert, Pierre-Hugues | | Mahut, Nicolas | | Mannarino, Adrian | | Paire, Benoit | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Duitsland (4) |
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| Gojowczyk, Peter | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Haase, Robin |
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| Donskoy, Evgeny | | Khachanov, Karen | | Rublev, Andrey |
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| Anderson, Kevin |
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| Chung, Hyeon |
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| Spanje (7) |
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| Bautista Agut, Roberto | | Carreno Busta, Pablo | | Ferrer, David | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Verenigd Koninkrijk (1) |
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| Edmund, Kyle |
| | Verenigde Staten (5) |
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| Harrison, Ryan | | Isner, John | | Johnson, Steve | | Querrey, Sam | | Sock, Jack |
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