| Argentina (2) |
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| Pella, Guido | | Schwartzman, Diego |
| | Australia (1) |
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| Tomic, Bernard |
| | Austria (3) |
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| Novak, Dennis | | Ofner, Sebastian | | Thiem, Dominic |
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| Dzumhur, Damir |
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| Bulgaria (1) |
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| Dimitrov, Grigor |
| | France (5) |
|---|
| Gasquet, Richard | | Herbert, Pierre-Hugues | | Pouille, Lucas | | Simon, Gilles | | Tsonga, Jo-Wilfried |
| | Germany (3) |
|---|
| Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander |
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|---|
| Fabbiano, Thomas | | Fognini, Fabio |
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| Troicki, Viktor |
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| Anderson, Kevin |
| | Spain (5) |
|---|
| Carreno Busta, Pablo | | Ferrer, David | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Ramos-Vinolas, Albert |
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| Edmund, Kyle |
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|---|
| Isner, John | | Querrey, Sam |
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