| Argentina (1) |
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| Del Potro, Juan Martin |
| | Australia (4) |
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| Aiava, Destanee | | De Minaur, Alex | | Kokkinakis, Thanasi | | Tomljanovic, Ajla |
| | | Croazia (1) |
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| Lucic-Baroni, Mirjana |
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| Berdych, Tomas | | Kvitova, Petra | | Pliskova, Kristyna | | Safarova, Lucie |
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| Petkovic, Andrea | | Zverev, Mischa |
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| Sonego, Lorenzo |
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| Radwanska, Agnieszka |
| | | Russia (1) |
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| Medvedev, Daniil |
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| Djokovic, Novak |
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| Chung, Hyeon |
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| Bautista Agut, Roberto | | Lopez, Feliciano | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Stati Uniti (6) |
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| Donaldson, Jared | | Keys, Madison | | Querrey, Sam | | Rogers, Shelby | | Tiafoe, Frances | | Young, Donald |
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