Australian Open: Women's round-up

Round-up of the fourth round women's singles matches from Melbourne park.

Kerber became the second World No. 1 to bow out in Melbourne on Sunday, losing 6-2, 6-3 under the lights at Rod Laver Arena against Coco Vandeweghe.

DEFENDING CHAMPION KERBER OUSTED

Defending champion Angelique Kerber crashed out of the Australian Open in the fourth round with a straight-sets defeat to the magnificent Coco Vandeweghe.

Kerber became the second World No. 1 to bow out in Melbourne on Sunday, losing 6-2, 6-3 under the lights at Rod Laver Arena after Andy Murray had been stunned by Mischa Zverev.

Top seed Kerber had no answer to an inspired Vandeweghe, who will face Garbine Muguruza in her first Australian Open quarterfinal.

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MUGURUZA PROGRESSES

Red-hot Spaniard Garbine Muguruza blasted into her first Australian Open quarterfinal on Sunday with a resounding straight-sets thumping of Sorana Cirstea.

The French Open champion was too much for the Romanian, winning 6-2, 6-3 on Margaret Court Arena and looking as if she is hitting her stride in Melbourne.

She will now play either German world number one Angelique Kerber or unseeded American Coco Vandeweghe for a place in the semi-finals.

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VENUS WILLIAMS THROUGH

Ageless Venus Williams powered into an amazing 37th career Grand Slam quarterfinal on Sunday to set up an Australian Open showdown with dogged Russian Anastasia Pavlyuchenkova.

The American, 36, needed all her big-match experience to dismantle determined German qualifier Mona Barthel on Rod Laver Arena 6-3, 7-5.

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Williams' victory puts her into a ninth quarterfinal at Melbourne Park in a tournament she is yet to win during a storied career that has earned her seven Grand Slam titles, though none since Wimbledon 2008.

Next up is Pavlyuchenkova, who upset Svetlana Kuznetsova 6-3, 6-3, ending the fellow Russian's distant dream of a third Grand Slam title.

PAVLYUCHENKOVA BEAT KUZNETSOVA 6-3, 6-3

Anastasia Pavlyuchenkova shattered fellow Russian Svetlana Kuznetsova's distant dream of a third Grand Slam title by sweeping past the veteran and into the quarter-finals.

The 6-3, 6-3 win on Rod Laver Arena put the 25-year-old into the last eight at Melbourne Park for the first time in nine attempts.

A 2006 Australian Open girls champion, Pavlyuchenkova will now play either American great Venus Williams or German qualifier Mona Barthel for a place in the semi-finals.

"I'm kind of in shock at the moment, but at the same time very happy" said Pavlyuchenkova. "It was really, really tough. I think both of us were nervous before and during the match."