Learner Tien has continued his stunning start to the 2025 season by clinching a stunning win over Alexander Zverev in Acapulco.
Tien rose to 80th in the world rankings after the Australian Open, where the American reached the fourth round.
Teenage star Tien emerged through qualifying before beating 2024 finalist and world number five Daniil Medvedev, with Lorenzo Sonego eventually ending his dream run.
Tien has been tipped to have a huge following, with the 19-year-old now securing another huge upset with his win over world number two Zverev.
The American teenager defeated Mexican Open top seed Zverev 6-3, 6-4 in the round of 16, again having made it through qualifying.
