It was the 19-year-old's second career win over a top-five player, after he defeated Daniil Medvedev in the Australian Open second round in January.

American Learner Tien knocked out No. 1 seed Alexander Zverev, while three players exited citing stomach issues.

Day 3 of the ATP Mexican Open in Acapulco was chaotic, as all five of the top seeds were out. Tommy Paul and Casper Ruud ...

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...

Zverev was upset 6-3, 6-4 by world No 83 Learner Tien in the second round of the ATP 500 tournament in Acapulco. Zverev, who ...

Casper Ruud and Tommy Paul both pulled out of their last 16 matches at the Mexican Open, while Holger Rune managed just three ...

Casper Ruud was one of three top seeds to exit the Mexican Open on Wednesday due to the effects of a stomach bug, while both ...

Find out how to watch, live stream, TV channel, tournament information, & more for Denis Shapovalov vs. Marcos Giron at the ...

Casper Ruud was one of three top seeds to exit the Mexican Open on Wednesday due to the effects of a stomach bug, while both ...

Top seed Alexander Zverev and fifth seed Ben Shelton were eliminated inside Arena GNP Seguros. Zverev went down to 19-year-old qualifier Learner Tien, 6-3, 6-4, while Shelton was on the receiving end ...