No. 19 seed Madison Keys scored the big upset on Day 9 of the Australian Open, defeating No. 6 Elena Rybakina 6-3, 1-6, 6-3 at Margaret Court Arena to advance to the tournament quarterfinals.

World No.1 and defending champion Jannik Sinner, Iga Swiatek, Elina Svitolina, Elena Rybakina and other big players will be in action on Day 9 of the hard court major at the Melbourne Park.

Defending champion Jannik Sinner has moved into the quarterfinals at the Australian Open after beating Holger Rune during a match slowed down by medical timeouts for each player and a delay because the net got knocked loose.

They also have a dead-even head-to-head record. Keys won their first two matches, and Rybakina came back to win the next two, including their only meeting of 2024, on hard courts in Miami. Keys has won eight straight matches in Adelaide and Melbourne, while Rybakina, with new coach Goran Ivanisevic, hasn’t dropped a set this week.

The Day 9 of the Australian Open 2025 is underway at Melbourne Park as it promises to deliver some fantastic and exciting tennis. Jannik Sinner will battle it out against Holger Rune, while Gael Monfils will take on Ben Shelton.

(AP Photo/Vincent Thian) Madison Keys of the U.S. plays a backhand return to Elena Rybakina of Kazakhstan ... (AP Photo/Manish Swarup) Jannik Sinner of Italy reacts during his fourth round match ...

In the end, Sinner put his physical struggles aside ... eliminated 2022 Wimbledon champion Elena Rybakina 6-3, 1-6, 6-3, and now plays Elina Svitolina, a 6-4, 6-1 winner against Veronika Kudermetova.

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MELBOURNE, Australia (AP) — First came the medical timeouts, one each for Jannik Sinner and Holger ... eliminated 2022 Wimbledon champion Elena Rybakina 6-3, 1-6, 6-3, and now plays Elina ...

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

Follow live text and radio commentary featuring Emma Raducanu, Iga Swiatek and Jannik Sinner in the Australian Open in Melbourne, Australia.