Kvitova, Wozniacki advance to Dubai semifinals

Wozniacki, once ranked No. 1, defeated Marion Bartoli 4-6, 6-1, 6-4, capitalizing on 14 double-faults and 46 unforced errors by her opponent. Two double-faults cost Bartoli games in the second set.

Doubles specialist Roberta Vinci of Italy surprised former U.S. Open champ Sam Stosur 6-2, 6-4 in their quarterfinal. She will next face doubles partner Sara Errani, who downed Nadia Petrova of Russia 6-4, 0-6, 6-3.

Radwanska, ranked No. 4, had no answers for the big-hitting Kvitova, who neutralized her opponent with a powerful forehand.

"I think to beat Agnieszka here it means something more because she's defending champion, so she's playing well here," said Kvitova, who has a 4-1 record against the Pole. "So that's a good sign for me."

Kvitova had 38 unforced errors against Radwanska and said she would have to play better against Wozniacki.

"I am a player who is going for the winners, so I have to accept the unforced errors, too," she said. "I shoot bullets on the court next time."

Wozniacki was almost untouchable in the second set, and the third went back-and-fourth. Bartoli jumped ahead 2-0 and then Wozniacki ran off five straight games. Bartoli won two straight to make it 5-4 but Wozniacki was able to hang on and serve out the match.

Afterward, Diego Maradona, an ambassador for the Dubai Sports Council, came onto the court to give her one of his signed Argentina jerseys emblazoned with his No. 10. The Dane gave the soccer great a signed tennis racket.