Australian Open: Day 8

Petra Kvitova of the Czech Republic serves to Italy's Flavia Pennetta during their fourth-round match on Monday afternoon. Kvitova won 3-6, 6-3, 6-3.

Pennetta makes a backhand return to Kvitova during Monday's match.

Kvitova, who will face Vera Zvonareva in the quarterfinals, makes a backhand return during Monday's victory.

Alexandr Dolgopolov makes a forehand return to Sweden's Robin Soderling during their fourth-round match. Dolgopolov won 1-6, 6-3, 6-1, 4-6, 6-2.

Soderling serves to Dolgopolov as a bird flies near.

Perspiration beads on the forehead of Soderling during Monday's match.

Dolgopolov is congratulated by two-time Australian Open champion and Channel 7 television commentator Jim Courier following his win over Soderling.

Great Britain's Andy Murray makes a forehand return to Austria's Jurgen Melzer during their fourth-round match. Murray won 6-3, 6-1, 6-1.

Melzer makes a backhand return to Murray during Monday's match.

Vera Zvonareva of Russia plays a backhand to Iveta Benesova of the Czech Republic. Zvonareva won 6-4, 6-1.

Benesova reacts during Monday's fourth-round match against Zvonareva.

Ellen Allgurin of Sweden plays a forehand during her first-round juniors match against Yulia Putintseva of Russia.

Nikola Milojevic of Serbia plays a forehand during his first-round juniors match against Chieh-Fu Wang of Chinese Taipei.

Belgium's Kim Clijsters celebrates her 7-6(3), 6-2 win over Russia's Ekaterina Makarova.

Makarova reacts to a lost point to Clijsters during their fourth-round match.

Kim Clijsters of Belgium plays a stroke during her fourth round women's singles match against Ekaterina Makarova of Russia on the eighth day of the Australian Open tennis tournament in Melbourne on January 24, 2011. Clijsters took the first set 7-6. IMAGE STRICTLY RESTRICTED TO EDITORIAL USE -- STRICTLY NO COMMERCIAL USE AFP PHOTO/Greg WOOD (Photo credit should read GREG WOOD/AFP/Getty Images)

Rafael Nadal of Spain throws a wrist band to the spectators after his 6-2, 6-4, 6-3 win over Marin Cilic of Croatia.

Cilic wipes his face during his fourth-round match with Nadal.

Nadal fans in the crowd show their support.

Country music legend Kenny Rogers watches the match between Nadal and Cilic on Monday night.

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