| Argentina (2) |
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| Cachin, Pedro | | Coria, Federico |
| | Austria (2) |
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| Rodionov, Jurij | | Thiem, Dominic |
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| Fils, Arthur | | Gasquet, Richard | | Lestienne, Constant | | Monfils, Gael | | Pouille, Lucas |
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| Altmaier, Daniel | | Koepfer, Dominik | | Marterer, Maximilian |
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| Fucsovics, Marton |
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| Musetti, Lorenzo |
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| Zandschulp, Botic van de |
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| Hurkacz, Hubert |
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| Borges, Nuno | | Faria, Jaime | | Rocha, Henrique | | Sousa, Joao |
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| Serbia (1) |
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| Kecmanovic, Miomir |
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| Bautista Agut, Roberto | | Jorda Sanchis, David | | Llamas Ruiz, Pablo | | Martinez, Pedro |
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| Choinski, Jan |
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