| Argentina (1) |
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| Pella, Guido |
| | Australia (2) |
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| Ebden, Matthew | | Tomic, Bernard |
| | Belgium (1) |
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| Bemelmans, Ruben |
| | Canada (2) |
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| Auger-Aliassime, Felix | | Pospisil, Vasek |
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| China (2) |
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| Wu, Yibing | | Zhang, Ze |
| | Cyprus (1) |
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| Baghdatis, Marcos |
| | France (2) |
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| Mannarino, Adrian | | Monfils, Gael |
| | Georgia (1) |
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| Basilashvili, Nikoloz |
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| Germany (1) |
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| Zverev, Mischa |
| | India (1) |
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| Gunneswaran, Prajnesh |
| | Italy (2) |
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| Berrettini, Matteo | | Fognini, Fabio |
| | Kazakhstan (1) |
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| Kukushkin, Mikhail |
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| | | Russia (1) |
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| Donskoy, Evgeny |
| | South Africa (1) |
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| Harris, Lloyd |
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| South Korea (1) |
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| Chung, Hyeon |
| | Taiwan (1) |
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| Tseng, Chun-Hsin |
| | | United States (5) |
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| Fritz, Taylor | | Klahn, Bradley | | Querrey, Sam | | Sandgren, Tennys | | Smyczek, Tim |
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