Defending champ Jannik Sinner drops set for first time since October, but rallies for win; American Danielle Collins plays villain while advancing.

The final match of the day saw American Learner Tien, playing in his first major outside of the U.S. Open, upset No. 5 seed Daniil Medvedev in a five-set classic, 6-3, 7-6, 6-7, 1-6, 7-6, that ended at 2:54 a.m. local time. Medvedev had reached three of the past four Australian Open finals, but could not fend off a ferocious Tien.

Defending champion Jannik Sinner’s consecutive-sets streak has ended in the second round of the Australian Open.

Jannik Sinner has announced that he will part ways with his coach Darren Cahill at the end of the season. The Australian, who joined Sinner's team in July 2022, will conclude the 2025 campaign before stepping back from full-time tennis.

In a match slated for Tuesday, Tristan Schoolkate (No. 173 in rankings) will meet Jannik Sinner (No. 1) in the Round of 64 at the Australian Open.Sinner’s last competition was a win, 6-2,

Jannik Sinner has started his Australian Open title defense with a challenging win over No. 35-ranked Nicolas Jarry.

World No.1 Jannik Sinner survived an early scare against Tristan Schoolkate and advanced to the third round of the men's singles. Sinner took two hours and 46 minutes to win the match 4-6, 6-4, 6-1, 6-3.

World No 1 Jannik Sinner makes it 16 wins in a row, while Nick Kyrgios and Thanasi Kokkinakis pull out of their doubles match in second set through injury to the latter; watch action from ATP and WTA

But having stunned ninth seed Andrey Rublev in straight sets in the first round, the teenager went down fighting, Italy’s Lorenzo Sonego pulling through 6-7 (6-8), 6-3, 6-1, 3-6, 6-3 to disappoint the vocal Brazilian fans.

Sinner became the youngest player to register nine consecutive wins at the Australian Open in the men's singles since Novak Djokovic between 2008 and 2009