| Argentina (2) |
|---|
| Cerundolo, Francisco | | Etcheverry, Tomas Martin |
| | Australia (1) |
|---|
| De Minaur, Alex |
| | Austria (2) |
|---|
| Neumayer, Lukas | | Rodionov, Jurij |
| | Bulgaria (1) |
|---|
| Dimitrov, Grigor |
|
| Repubblica Ceca (2) |
|---|
| Machac, Tomas | | Mensik, Jakub |
| | Francia (2) |
|---|
| Assche, Luca Van | | Mannarino, Adrian |
| | Georgia (1) |
|---|
| Basilashvili, Nikoloz |
| | Germania (1) |
|---|
| Zverev, Alexander |
|
| Italia (5) |
|---|
| Arnaldi, Matteo | | Berrettini, Matteo | | Cobolli, Flavio | | Darderi, Luciano | | Musetti, Lorenzo |
| | Olanda (1) |
|---|
| Griekspoor, Tallon |
| | | Russia (3) |
|---|
| Khachanov, Karen | | Medvedev, Daniil | | Rublev, Andrey |
|
| Spagna (3) |
|---|
| Alcaraz, Carlos | | Landaluce, Martin | | Merida, Daniel |
| | Regno Unito (3) |
|---|
| Fearnley, Jacob | | Fery, Arthur | | Norrie, Cameron |
| | Stati Uniti (4) |
|---|
| Nakashima, Brandon | | Paul, Tommy | | Tiafoe, Frances | | Tien, Learner |
|