| Argentinië (5) |
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| Del Potro, Juan Martin | | Delbonis, Federico | | Kicker, Nicolas | | Mayer, Leonardo | | Schwartzman, Diego |
| | Oostenrijk (1) |
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| Thiem, Dominic |
| | | Bosnië-Herzegovina (1) |
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| Dzumhur, Damir |
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| Bulgarije (1) |
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| Dimitrov, Grigor |
| | Canada (2) |
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| Raonic, Milos | | Shapovalov, Denis |
| | | Tsjechië (1) |
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| Berdych, Tomas |
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| Frankrijk (6) |
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| Benneteau, Julien | | Gasquet, Richard | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas |
| | Georgië (1) |
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| Basilashvili, Nikoloz |
| | Duitsland (5) |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Griekenland (1) |
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| Tsitsipas, Stefano |
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| Italië (2) |
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| Fognini, Fabio | | Lorenzi, Paolo |
| | Japan (2) |
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| Nishikori, Kei | | Sugita, Yuichi |
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| Kukushkin, Mikhail |
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| Haase, Robin |
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| Roemenië (1) |
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| Copil, Marius |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil |
| | Servië (2) |
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| Djokovic, Novak | | Lajovic, Dusan |
| | Zuid-Afrika (1) |
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| Anderson, Kevin |
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| Zuid-Korea (1) |
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| Chung, Hyeon |
| | Spanje (9) |
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| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Garcia-Lopez, Guillermo | | 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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| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Sandgren, Tennys | | Sock, Jack |
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