| Weißrussland (1) |
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| Azarenka, Victoria |
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| Dutra Silva, Rogerio |
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| Duque-Mariño, Mariana | | Giraldo, Santiago |
| |
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| Baghdatis, Marcos |
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| Siniakova, Katerina |
| | | Frankreich (2) |
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| Paire, Benoit | | Simon, Gilles |
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| Georgien (1) |
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| Basilashvili, Nikoloz |
| | Griechenland (1) |
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| Tsitsipas, Stefano |
| | |
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| Gulbis, Ernests | | Sevastova, Anastasija |
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| Muller, Gilles |
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| Djokovic, Novak |
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| Spanien (6) |
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| Arruabarrena, Lara | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Garcia-Lopez, Guillermo | | Suárez Navarro, Carla | | Taberner, Carlos |
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| Wawrinka, Stan |
| | Vereinigte Staaten (3) |
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| Kenin, Sofia | | Querrey, Sam | | Tiafoe, Frances |
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| Istomin, Denis |
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