| Argentina (3) |
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| Delbonis, Federico | | Pella, Guido | | Schwartzman, Diego |
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| De Minaur, Alex | | Millman, John | | Popyrin, Alexei |
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| Thiem, Dominic |
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| Dimitrov, Grigor |
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| Garin, Christian |
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| Chardy, Jeremy | | Herbert, Pierre-Hugues | | Humbert, Ugo | | Mannarino, Adrian | | Paire, Benoit |
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| Basilashvili, Nikoloz |
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| Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Harris, Lloyd |
| | Španělsko (11) |
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| Alcaraz, Carlos | | Andujar, Pablo | | Bautista Agut, Roberto | | Carreno Busta, Pablo | | Davidovich Fokina, Alejandro | | Martinez, Pedro | | Munar, Jaume | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Taberner, Carlos | | Verdasco, Fernando |
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| Evans, Daniel | | Norrie, Cameron |
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| Fritz, Taylor | | Giron, Marcos | | Isner, John | | Opelka, Reilly | | Paul, Tommy |
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