| Australia (1) |
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| Ebden, Matthew |
| | Austria (1) |
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| Thiem, Dominic |
| | | France (3) |
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| Gasquet, Richard | | Paire, Benoit | | Pouille, Lucas |
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| Georgia (1) |
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| Basilashvili, Nikoloz |
| | Germany (9) |
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| Bachinger, Matthias | | Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian | | Mayer, Florian | | Molleker, Rudolf | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Greece (1) |
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| Tsitsipas, Stefano |
| | Hungary (1) |
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| Fucsovics, Marton |
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| Italy (2) |
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| Berrettini, Matteo | | Seppi, Andreas |
| | Japan (2) |
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| Nishikori, Kei | | Sugita, Yuichi |
| | Netherlands (1) |
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| Haase, Robin |
| |
| Russia (2) |
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| Khachanov, Karen | | Youzhny, Mikhail |
| | | Slovenia (1) |
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| Bedene, Aljaz |
| | Spain (1) |
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| Bautista Agut, Roberto |
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| | | United States (2) |
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| Johnson, Steve | | Kudla, Denis |
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