| Belgien (2) |
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| Bemelmans, Ruben | | Goffin, David |
| | Bosnien og Herzegovina (1) |
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| Dzumhur, Damir |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix |
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| Berdych, Tomas |
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| Gasquet, Richard | | Herbert, Pierre-Hugues | | Mahut, Nicolas | | Paire, Benoit | | Pouille, Lucas |
| | Tyskland (4) |
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| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
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| Seppi, Andreas |
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| Muller, Gilles |
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| Bakker, Thiemo de | | Griekspoor, Tallon | | Haase, Robin |
| |
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| Copil, Marius |
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| Klizan, Martin |
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| Ferrer, David | | Lopez, Feliciano |
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| Federer, Roger | | Wawrinka, Stan |
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