| Argentina (4) |
|---|
| Del Potro, Juan Martin | | Delbonis, Federico | | Mayer, Leonardo | | Schwartzman, Diego |
| | Austria (1) |
|---|
| Thiem, Dominic |
| | | Bosnia and Herzegovina (1) |
|---|
| Dzumhur, Damir |
|
| Bulgaria (1) |
|---|
| Dimitrov, Grigor |
| | Canada (1) |
|---|
| Shapovalov, Denis |
| | | Croatia (2) |
|---|
| Cilic, Marin | | Coric, Borna |
|
| Czech Republic (1) |
|---|
| Berdych, Tomas |
| | France (5) |
|---|
| Gasquet, Richard | | Mannarino, Adrian | | Monfils, Gael | | Paire, Benoit | | Pouille, Lucas |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germany (3) |
|---|
| Gojowczyk, Peter | | Kohlschreiber, Philipp | | Zverev, Alexander |
|
| Greece (1) |
|---|
| Tsitsipas, Stefano |
| | Italy (6) |
|---|
| Baldi, Filippo | | Berrettini, Matteo | | Cecchinato, Marco | | Fognini, Fabio | | Seppi, Andreas | | Sonego, Lorenzo |
| | Japan (2) |
|---|
| Nishikori, Kei | | Sugita, Yuichi |
| | Luxembourg (1) |
|---|
| Muller, Gilles |
|
| Netherlands (1) |
|---|
| Haase, Robin |
| | Russia (2) |
|---|
| Khachanov, Karen | | Medvedev, Daniil |
| | Serbia (1) |
|---|
| Djokovic, Novak |
| | Slovenia (1) |
|---|
| Bedene, Aljaz |
|
| South Africa (1) |
|---|
| Anderson, Kevin |
| | Spain (6) |
|---|
| Carreno Busta, Pablo | | Ferrer, David | | Lopez, Feliciano | | Nadal, Rafael | | Ramos-Vinolas, Albert | | Verdasco, Fernando |
| | |
| Ukraine (1) |
|---|
| Dolgopolov, Alexandr |
| | United Kingdom (1) |
|---|
| Edmund, Kyle |
| | United States (7) |
|---|
| Donaldson, Jared | | Harrison, Ryan | | Isner, John | | Johnson, Steve | | Querrey, Sam | | Sock, Jack | | Tiafoe, Frances |
| |