DUBAI, United Arab Emirates — Novak Djokovic defeated Roger Federer for the second time in a month, a 6-3, 6-3 victory Saturday for his third consecutive Dubai Championships title.

DUBAI, United Arab Emirates — Novak Djokovic defeated Roger Federer for the second time in a month, a 6-3, 6-3 victory Saturday for his third consecutive Dubai Championships title.

Djokovic extended his unbeaten streak in 2011 to 12 matches with his 20th title. The third-ranked Serb beat Federer in the semifinals on his way to winning the Australian Open.

"I was aware of the challenge that is expected of me on the court, and I was aware of the fact that I need to be on top of my game in order to beat Roger," said Djokovic, who was taken to three sets earlier in the tournament by Tomas Berdych and Feliciano Lopez. "So the focus was there. I was serving really well, especially the first set. Just the perfect performance overall."

Federer played by far his worst match of the tournament. He squandered a 3-1 lead in the second set, losing the last five games.

Federer didn't lose a set in the four matches before he faced Djokovic and had a 14-1 record this year.

Federer leads Djokovic 13-8 for his career, but he has lost to the Serb at the last two Grand Slam tournaments, and now in Dubai.

Qatar Ladies Open

At Doha, Qatar, Vera Zvonareva defeated top-ranked Caroline Wozniacki 6-4, 6-4 to win the Qatar Ladies Open final.

The third-ranked Russian earned her 11th career WTA title and first since a victory in Pattaya City a year ago.

Wozniacki was hoping to add the Doha title to the one she won in Dubai six days ago. But the Dane lost her serve in the first game, and lost momentum early. Zvonareva rallied from 0-40 down in the eighth game and eventually served out the set.

The second set followed a similar pattern with Wozniacki breaking in the second game, only to see Zvonareva break back in the next. After eight deuces in the seventh game, Zvonareva made the decisive break with a forehand winner.

Woznaicki hit wide to end the match.

Delray Beach International

At Delray Beach, Fla., Juan Martin del Potro reached the finals of the Delray Beach International Tennis Championships with a 6-1, 7-5 win over second-seeded Mardy Fish.

Del Potro is playing in his first final since winning the 2009 U.S. Open.

He will play Janko Tipsarevic, who defeated Kei Nishikori 6-4, 6-4, today.