| Argentina (2) |
|---|
| Mayer, Leonardo | | Schwartzman, Diego |
| | Australia (2) |
|---|
| De Minaur, Alex | | Millman, John |
| | Canada (1) |
|---|
| Shapovalov, Denis |
| |
| Ecuador (1) |
|---|
| Quiroz, Roberto |
| | | Germany (2) |
|---|
| Brands, Daniel | | Zverev, Mischa |
| | Italy (3) |
|---|
| Berrettini, Matteo | | Cecchinato, Marco | | Seppi, Andreas |
|
| Kazakhstan (1) |
|---|
| Kukushkin, Mikhail |
| | Luxembourg (1) |
|---|
| Muller, Gilles |
| | Russia (1) |
|---|
| Medvedev, Daniil |
| |
| | Switzerland (1) |
|---|
| Wawrinka, Stan |
| | United Kingdom (4) |
|---|
| Clarke, Jay | | Edmund, Kyle | | Murray, Andy | | Norrie, Cameron |
| | United States (4) |
|---|
| Donaldson, Jared | | Fritz, Taylor | | Harrison, Ryan | | Johnson, Steve |
|
| Uzbekistan (1) |
|---|
| Istomin, Denis |
|