China's Li Na prepares to serve to Germany's Andrea Petkovic during their quarterfinal match on Tuesday at Melbourne Park. The ninth-seeded Li won 6-2, 6-4 to advance to the Australian Open semifinals for the second straight year.
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Petkovic makes a forehand return to Li during Tuesday's match. The 23-year-old German was playing in her first Grand Slam quarterfinal.
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Li was the only quarterfinalist from last year's Australian Open to make the last eight this year. Now the 28-year-old is headed back to the semifinals, where she bowed in two tiebreak sets to eventual champion Serena Williams in 2010.
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Petkovic struggled on serve throughout the afternoon, getting broken three times in the first set and twice in the second.
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Li improved to 10-0 this year with Tuesday's victory, having opened the season with a run to the Sydney title.
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Li signs autographs for fans after Tuesday's match. She will face Caroline Wozniacki in Thursday's semifinals.
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Switzerland's Roger Federer (right) and compatriot Stanislas Wawrinka (left) talk with chair umpire John Blom (center) before the start of their quarterfinal match.
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Federer did not concede a break point while converting both his chances in the first set, winning it at 6-1.
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Wawrinka, wearing sunscreen to battle the elements, put up more of a fight in the second set but still found himself staring down a 6-1, 6-3 deficit.
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Most Swiss spectators cheered for both Federer and Wawrinka during Tuesday's match.
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Federer (bottom) and Wawrinka (top) are friends off the court, having captured doubles gold together at the Beijing Olympics.
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Federer needed just 107 minutes to finish off the 6-1, 6-3, 6-3 victory and advance to his eighth consecutive Australian Open semifinal.
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Italy's Francesca Schiavone watches her backhand return to Denmark's Caroline Wozniacki during their quarterfinal match.
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Wozniacki made just 15 unforced errors to Schiavone's 46.
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Schiavone's endurance was pushed to the limit in the wake of Sunday's 4-hour, 44-minute victory over Svetlana Kuznetsova.
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Wozniacki trailed a set and a break at 1-3 in the second, but won six straight games en route to a 3-6, 6-3, 6-3 victory.
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Schiavone made a valiant push in the third set but couldn't back down her top-ranked opponent.
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Wozniacki advances to faces No. 9 Li Na in Thursday's semifinals.
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The roof is closed on Rod Laver Arena for Tuesday's quarterfinal match between Novak Djokovic and Tomas Berdych.
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The third-seeded Djokovic used the forehand to pick apart Berdych systematically during a 36-minute first set.
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Berdych forced a second-set tiebreak but lost 7-5 to fall into a two-set hole.
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A group of raucous Berdych fans watch Tuesday's match.
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Berdych capitalized on the first break points of the match to take a 4-1 lead in the second set, but it didn't hold.
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Djokovic finished off the 6-1, 7-6(5), 6-1 victory in 2 hours, 32 minutes.
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