It's an up-and-down day for favorites and the husband-and-wife duo of Gaël Monfils and Elina Svitolina wo their singles matches.

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.

Former Wimbledon champion Elena Rybakina joined Swiatek in the last 16 with a 6-3 6-4 win over Dayana Yastremska, but only after receiving treatment on her back, while eighth seed Emma Navarro and ninth seed Daria Kasatkina also advanced.

Daniil Medvedev’s meltdown and Danielle Collins’s squabble with the Aussie fans made headlines, while Aryna Sabalenka and Iga Świątek keep rolling.

More remarkably: Djokovic has now advanced to his fiftieth major semifinal, after beating Alcaraz in a grueling four-set match that went to about 1:00 am local time in Melbourne. That number sets yet another Djokovic record in men’s tennis, further cementing the athlete’s legendary status.

Eight women remain in the 2025 Australian Open, and three of them are Americans. That group of quarterfinalists is headlined by No. 3 seed Coco Gauff and includes No. 8 Emma Navarro and No. 19 Madison Keys. Sofia Kenin in 2020 was the last American woman to hoist the trophy in Melbourne.

LONDON (AP)—Jannik Sinner and Iga Swiatek have won the International Tennis Federation’s 2024 world champion awards. Swiatek edged out Aryna Sabalenka for the women’s singles award in the list announced by the ITF on Monday.

Iga Swiatek has continued her path of destruction through the draw at this year's Australian Open, storming past Germany’s Eva Lys in the fourth round of the first major of the year, 6-0, 6-1. And with that victory, she hits a new milestone: Swiatek is now through to the 10th Grand Slam quarterfinal of her career.

Two spectacular young superstars dominated men’s tennis in 2024. Novak Djokovic salvaged a tough year with a prestigious title, while Rafael Nadal retired after an unforgettable career.

Aryna Sabalenka and Jannik Sinner continue to impress, while a band of young talent announces themselves Down Under.

"The World Anti-Doping Agency (WADA) confirms that following a thorough review, it will not lodge an appeal to the Court of Arbitration for Sport (CAS) in the case of Polish tennis player, Iga Świątek, who tested positive for trimetazidine (TMZ), a prohibited substance, in August 2024," the WADA said in a statement.

World number one Jannik Sinner continues his Australian Open title defence against Marcus Giron in the third round - follow live.