| Austrália (6) |
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| Bolt, Alex | | De Minaur, Alex | | Duckworth, James | | Kubler, Jason | | Kyrgios, Nick | | Thompson, Jordan |
| | Bielorrússia (1) |
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| Ivashka, Ilya |
| | | Bósnia Herzegovina (1) |
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| Basic, Mirza |
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| Canadá (2) |
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| Pospisil, Vasek | | Shapovalov, Denis |
| | Chipre (1) |
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| Baghdatis, Marcos |
| | França (5) |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Millot, Vincent | | Paire, Benoit | | Pouille, Lucas |
| | Alemanha (2) |
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| Zverev, Alexander | | Zverev, Mischa |
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| Grécia (1) |
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| Tsitsipas, Stefano |
| | Japão (3) |
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| Nishikori, Kei | | Sugita, Yuichi | | Watanuki, Yosuke |
| | Lituânia (1) |
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| Berankis, Ricardas |
| | Polónia (1) |
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| Hurkacz, Hubert |
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| | Rússia (5) |
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| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey | | Youzhny, Mikhail |
| | Eslováquia (1) |
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| Lacko, Lukas |
| | Coreia do Sul (1) |
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| Chung, Hyeon |
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| | | Reino Unido (2) |
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| Edmund, Kyle | | Murray, Andy |
| | Estados Unidos (12) |
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| Donaldson, Jared | | Isner, John | | Johnson, Steve | | Krueger, Mitchell | | Kudla, Denis | | Kwiatkowski, Thai-Son | | McDonald, Mackenzie | | Paul, Tommy | | Rubin, Noah | | Smyczek, Tim | | Tiafoe, Frances | | Young, Donald |
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