In a stunning upset at the Australian Open, American teenager Learner Tien defeated former World No. 1 Daniil Medvedev in a thrilling five-set match that extended into the early mornings. Tien, ranked No. 121 in the world, showcased remarkable skill and determination, ultimately winning the match as it reached a dramatic conclusion around 3 a.m. Medvedev faced frustration over his unexpected exit and could face a hefty fine following his outburst during the match. The result marks a significant highlight in the tournament as Tien joins the ranks of rising American tennis stars making their mark.