American teenager stuns former World No. 1 at 2025 Australian Open
Another day, another teenager ousting a top-10 player at the 2025 Australian Open. That has been the theme of the year's first major, with Brazilian Joao Fonseca defeating No. 9 Andrey Rublev, Czech teenager Jakub Mensik ousting No. 6 Casper Ruud, and now, American teenager Learner Tien taking down No. 5 Daniil Medvedev.