| Argentinien (1) |
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| Pella, Guido |
| | Österreich (1) |
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| Thiem, Dominic |
| | | Bosnien und Herzegowina (1) |
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| Dzumhur, Damir |
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| | Tschechien (1) |
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| Berdych, Tomas |
| | Frankreich (2) |
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| Herbert, Pierre-Hugues | | Mannarino, Adrian |
| | Georgien (1) |
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| Basilashvili, Nikoloz |
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| Deutschland (3) |
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| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Marterer, Maximilian |
| | Ungarn (1) |
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| Fucsovics, Marton |
| | Italien (4) |
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| Berrettini, Matteo | | Cecchinato, Marco | | Lorenzi, Paolo | | Seppi, Andreas |
| | Litauen (1) |
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| Berankis, Ricardas |
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| Die Niederlande (1) |
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| Haase, Robin |
| | Katar (1) |
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| Zayid, Mubarak Shannan |
| | Rumänien (1) |
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| Copil, Marius |
| | Russland (2) |
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| Khachanov, Karen | | Rublev, Andrey |
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| Serbien (2) |
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| Djokovic, Novak | | Lajovic, Dusan |
| | Spanien (4) |
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| Bautista Agut, Roberto | | Garcia-Lopez, Guillermo | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | Schweiz (1) |
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| Wawrinka, Stan |
| |
| Ukraine (1) |
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| Stakhovsky, Sergiy |
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