Learner Tien pulled off a massive upset against Daniil Medvedev at the Australian Open. So, who is Tien, the 19-year-old out of California?

American teen Learner Tien pulled off the biggest upset so far at the 2025 Australian Open, ousting Russian Daniil Medvedev -- the No. 5 player in the world -- in a 4-hour, 49-minute thriller at Margaret Court Arena.

The Irvine native and 19-year-old qualifier, who played one semester at USC, wins a 4-hour, 49-minute thriller that ends at nearly 3 a.m. in Melbourne

No. 5 Daniil Medvedev, 6-3, 7-6 (4), 6-7 (8), 1-6 ... Iva Jovic, 6-0, 6-3 No. 8 Emma Navarro def. Wang Xiyu, 6-3, 3-6, 6-4 No. 9 Daria Kasatkina def. Wang Yafan, 6-2, 6-0 No. 10 Danielle Collins ...

There are six American men and five American women in the third round. Tommy Paul, Coco Gauff and Jessica Pegula all play Thursday. No. 17 Frances Tiafoe, a two-time U.S. Open semifinalist, was upset by Hungary’s Fábián Marozsán in five sets in the second round.

Iga Swiatek rushed through her first set in 26 minutes and completed her 6-0, 6-2 second-round win over Rebecca Sramkova in an hour at the Australian Open.

When they resumed, Medvedev broke and served for the victory ... So now I just focus on tennis.” Emma Navarro, a U.S. Open semifinalist last year and seeded in the top eight for the first ...

American Learner Tien upset No. 5 seeded Daniil Medvedev 6-3, 7-6 (4), 6-7 (8), 1-6, 7-6 (10-7) at the 2025 Australian Open, in a 4-hour, 49-minute match that began Thursday night and ended early Frid

MELBOURNE, Australia — Australian Open women’s champion Madison Keys returned to her career-best ranking on Monday and joins three other American women in the WTA top 10, while men’s champion Jannik Sinner maintained his significant lead atop the ATP list.

The first Grand Slam of 2025 is done, and we learned a few things along the way. One is that Jannik Sinner is far and above the rest of the players on the ATP tour. OK, maybe we already knew that, but he re-enforced the thought.

Now that the dust has settled and the trophies lifted, let’s put a bow on this baby with 25 thoughts. 1 – Madison Keys is the story of this tournament. No ands, ifs or butts about it. The American took us all by surprise with her ability to manage her nerves in the biggest moments against an absolutely brutal draw.

Defending champion Jannik Sinner raced into the Australian Open semi-finals on Wednesday in imperious fashion after Iga Swiatek was equally ruthless to close on a first Melbourne crown.