Australian Open: Day 7

Caroline Wozniacki of Denmark wipes her face with a towel during Saturday's fourth-round match against Latvia's Anastasija Sevastova at Melbourne Park. The top-seeded Wozniacki won 6-3, 6-4 to advance to the quarterfinals, where she will meet Francesca Schiavone.

An aerial view of the Wozniacki-Sevastova match using a variable planed lens.

Wozniacki leans over the net and attempts to keep her balance after defeating Sevastova.

Sevastova returns Wozniacki during their match.

Li Na of China returns to Victoria Azarenka of Belarus during their fourth-round match. The ninth-seeded Li won 6-3, 6-3 and advanced to a quarterfinal meeting with Andrea Petkovic.

Azarenka returns to Li during Saturday's match. The eighth-seeded Belarusian hit just 12 winners in a losing effort.

Li, a semifinalist in Melbourne last year, serves to Azarenka.

Roger Federer of Switzerland waves to the crowd after a practice session Saturday at Melbourne Park.

Bob Bryan and Mike Bryan of the United States of America celebrate match point of their third-round doubles match against Benjamin Becker of Germany and Michael Kohlmann of Germany.

Jaden Grinter of New Zealand plays a forehand during his first-round juniors match against Dimitri Bretting of Switzerland.

Daniel Nestor of Canada (top) serves during a third-round doubles match with Max Mirnyi of Belarus (bottom).

Novak Djokovic of Serbia plays a stroke during his fourth-round match against Nicolas Almagro of Spain. Djokovic won 6-3, 6-4, 6-0.

Ana Ivanovic (center) and friends watch the Djokovic-Almagro match.

Almagro plays a backhand to Djokovic during Saturday's match.

Tomas Berdych of the Czech Republic celebrates after beating Fernando Verdasco of Spain in their fourth-round match. Berdych won 6-4, 6-2, 6-3.

Verdasco returns to Djokovic during Saturday's match.

Francesca Schiavone of Italy returns to Svetlana Kuznetsova of Russia during their fourth-round match. Schiavone won 6-4, 1-6, 16-14.

Schiavone falls over the net during her fourth-round match.

Roger Federer hits a forehand return to Spain's Tommy Robredo during their fourth-round match. Federer won 6-3, 3-6, 6-3, 6-2.

Robredo looks skyward during Saturday's match.

Germany's Andrea Petkovic celebrates a break point win over Russia's Maria Sharapova during their fourth-round match. Petkovic won 6-2, 6-3.

Sharapova reaches for a backhand return against Petkovic.

Andy Roddick of the United States plays a forehand against Stanislas Wawrinka in their fourth-round match.

Wawrinka celebrates his 6-3, 6-4, 6-4 win over Roddick.

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