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

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.

But it was her return game that did the loudest talking Monday in an Australian Open battle featuring two of the WTA’s most fearless ball-strikers. Taking on sixth seed Elena Rybakina, Keys surged ahead for a 6-3, 1-6, 6-3 victory.

No. 19 seed American Madison Keys moved into the Australian Open quarterfinals for the fourth time in her career by ousting No. 6 seed Elena Rybakina of Kazakhstan on Monday.

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 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.

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.

Adelaide Open champion Keys had lost to the Kazakh in their last two encounters but was well in control for most of the last 16 tie.

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

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.