| Argentina (1) |
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| Schwartzman, Diego |
| | Australia (2) |
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| Ebden, Matthew | | Tomic, Bernard |
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| Thiem, Dominic |
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| Tsitsipas, Stefano |
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| Daniel, Taro | | Soeda, Go | | Sugita, Yuichi | | Takahashi, Yusuke | | Uchiyama, Yasutaka |
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| Medvedev, Daniil |
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| Troicki, Viktor |
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| Dolgopolov, Alexandr |
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| Harrison, Ryan | | Johnson, Steve | | Querrey, Sam | | Young, Donald |
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