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.

The No. 6 seed missed multiple break points to seize the advantage in the third set and Keys profited to move into the quarterfinals.

Elena Rybakina, the sixth seed at Melbourne Park, had looked in fine form in the early rounds, but came into Monday's clash with Madison Keys at Margaret Court Arena carrying a back issue

Elina Svitolina rallied from 4-1 down defeat Veronika Kudermetova 6-4, 6-1 to reach the Australian Open quarterfinals. Svitolina will face Madison Keys in the next round.

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. Gauff, 20, will look to continue her hot start to the season when she meets No. 11 Paula Badosa of Spain at 7:30 ET on Monday night.

American Madison Keys upset sixth seed Elena Rybakina 6-3 1-6 6-3 in a roller-coaster match at Margaret Court Arena to march into the quarter-finals of the Australian Open on Monday and extend her win streak to nine matches this year.

She will next play Ukraine's Elina Svitolina, who beat Veronika Kudermetova 6-4, 6-1 earlier on Jan 20. Read more at straitstimes.com.

19th seed Madison Keys of the United States has reached the Australian Open quarter-finals for the fourth time in her career. She clinched a hard-fought win over sixth seed Elena Rybakina of Kazakhstan. The match lasted 1 hour and 49 minutes, ending with a scoreline of 6-3, 1-6, 6-3 in favor of Keys.