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.

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.

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

American Madison Keys first made the Australian Open semifinals 10 years ago. A decade on, she hopes to do it again, but she'll have to go through Ukraine's Elina Svitolina.

Madison Keys recalled a couple of tough Australian Open losses, including one to the legendary Serena Williams, shortly after returning to the Slam’s quarterfinals on Monday.

In the Australian Open Round of 16 on Sunday, No. 7-ranked Elena Rybakina takes on No. 14 Madison Keys.Rybakina secured a two-set victory over Dayana Yastremska (6-3, 6-4) in the Round of 32 in

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.

Here is everything you need to know about Madison Keys vs. Danielle Collins, including TV and streaming options for the match.

Rock Island's Madison Key is one of the last eight players still alive at the Australian Open, the first tennis Grand Slam of the year.

Danielle Collins keeps perspective after falling to fellow American Madison Keys in the third round of the Australian Open