| Argentina (5) |
|---|
| Del Potro, Juan Martin | | Delbonis, Federico | | Kicker, Nicolas | | Mayer, Leonardo | | Schwartzman, Diego |
| | | | Bosnien og Herzegovina (1) |
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| Dzumhur, Damir |
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| Bulgarien (1) |
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| Dimitrov, Grigor |
| | Canada (2) |
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| Raonic, Milos | | Shapovalov, Denis |
| | | Tjekkiet (1) |
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| Berdych, Tomas |
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| Frankrig (6) |
|---|
| Benneteau, Julien | | Gasquet, Richard | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas |
| | Georgien (1) |
|---|
| Basilashvili, Nikoloz |
| | Tyskland (5) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Struff, Jan-Lennard | | Zverev, Alexander | | Zverev, Mischa |
| | Grækenland (1) |
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| Tsitsipas, Stefano |
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| Italien (2) |
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| Fognini, Fabio | | Lorenzi, Paolo |
| | Japan (2) |
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| Nishikori, Kei | | Sugita, Yuichi |
| | Kasakhstan (1) |
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| Kukushkin, Mikhail |
| |
| Rumænien (1) |
|---|
| Copil, Marius |
| | Rusland (3) |
|---|
| Donskoy, Evgeny | | Khachanov, Karen | | Medvedev, Daniil |
| | Serbien (2) |
|---|
| Djokovic, Novak | | Lajovic, Dusan |
| | Sydafrika (1) |
|---|
| Anderson, Kevin |
|
| | Spanien (9) |
|---|
| Andujar, Pablo | | Bautista Agut, Roberto | | Carballes Baena, Roberto | | Carreno Busta, Pablo | | Garcia-Lopez, Guillermo | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Storbritannien (1) |
|---|
| Edmund, Kyle |
| | USA (5) |
|---|
| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Sandgren, Tennys | | Sock, Jack |
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