Defending champion Madison Keys has been knocked out of the Australian Open by Jessica Pegula in an all-American fourth-round match.

Naomi Osaka has withdrawn from the Australian Open before her third-round match against Maddison Inglis.

Jannik Sinner made a dramatic comeback at the Australian Open, overcoming cramps and getting benefit from the tournament's extreme heat policy to beat Eliot Spizzirri.

The safety protocols for COVID-19 have been a touchy subject at the Australian Open.

Spain's Rafael Nadal reacts during his first round match against Serbia's Laslo Djere at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Feb. 9, 2021. The lingering back soreness that bothered the 20-time major champion ahead of the Australian Open wasn't going to stop him from finishing his first-round match as quickly as he could. Fourth-seeded Daniil Medvedev extended his winning streak to 15 matches with a 6-2, 6-2, 6-4 win over Vasek Pospisil and seventh-seeded Andrey Rublev beat Yannick Hanfmann 6-3, 6-3, 6-4. “Coming out here and really enjoying the thrill of the fight.”Garbiñe Muguruza, the Australian Open runner-up last year, defeated Margarita Gasparyan 6-4, 6-0. Two-time Australian Open quarterfinalist Tennys Sandgren also went through the hard lockdown.