| Argentina (2) |
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| Del Potro, Juan Martin | | Pella, Guido |
| | Brasil (1) |
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| Dutra Silva, Rogerio |
| | Canada (1) |
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| Shapovalov, Denis |
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| Czech Republic (1) |
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| Vesely, Jiri |
| | Germany (1) |
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| Gojowczyk, Peter |
| | Greece (1) |
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| Tsitsipas, Stefano |
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| Japan (2) |
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| Daniel, Taro | | Sugita, Yuichi |
| | | Netherlands (1) |
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| Haase, Robin |
| | New Zealand (1) |
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| Venus, Michael |
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| | | Russia (2) |
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| Khachanov, Karen | | Rublev, Andrey |
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| South Korea (1) |
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| Chung, Hyeon |
| | Spain (2) |
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| Bautista Agut, Roberto | | Ferrer, David |
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| Edmund, Kyle |
| | United States (8) |
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| Harrison, Ryan | | Isner, John | | Johnson, Steve | | Querrey, Sam | | Sandgren, Tennys | | Smyczek, Tim | | Sock, Jack | | Young, Donald |
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