It was Wozniacki's fourth tournament victory this year, unmatched on the WTA Tour, and a welcome boost ahead of the French Open.

Starting sluggish following a tough three-set win over Francesca Schiavone late Friday, the Dane found her touch and fighting spirit in the second set against the 31st-ranked Chinese.

The only drawback was that Wozniacki needed medical treatment on her left thigh in the third set before clinching victory.

"If there is a possibility to call it a tie, we should have called it a tie," Wozniacki told the sellout crowd of 4, 500.

Despite victory, the cream-colored bandage round her left leg left a question mark over Wozniacki's first round match at Roland Garros against a player twice her age, 40-year-old Kimiko Date-Krumm of Japan. With two tense three-setters in as many days, Wozniacki played over five hours of top tennis in just over 24 hours before heading for Paris.

Wozniacki looked tentative throughout the first set and committing five double faults was only part of her problem.

She found it tough to focus and get the length on her groundstrokes right as the wind rustled through the plane trees lining center court.

In contrast, Peng played with abandon, looking for the inside of the lines with her double-fisted forehand and backhand. She was constantly looking for winners while Wozniacki was mostly waiting for the Chinese to make errors.

Peng, 25, was looking for her first WTA tour win but is 0-for-4 so far.

Wozniacki was coming off a 2-hour thriller late Friday against defending French Open champion Schiavone, which she won 6-4, 4-6, 6-3, and often looked sluggish under sunny conditions and 25C (77F) on the Primerose center court.

Peng already had the momentum with her, coming off a convincing 6-3, 6-3 win against third-ranked Vera Zvonareva on Friday.

Yet in the second set, with her first title beckoning, Peng started to falter. In the third game she failed to convert seven break points and the momentum of the match turned.

Wozniacki immediately broke, shook off the fatigue and finally started playing like the world's top-ranked player.

She won the set on an ace.

But nothing was going to be easy. After forcing a break early in the third set, Wozniacki looked in pain and asked for doctor's treatment.

She came back with a huge tape high up round her left thigh. Soon Peng broke back for 3-3 as Wozniacki no longer moved around court with ease.

But it was Peng's time to show weakness, making the wrong decisions and putting easy balls wide.

Despite her medical problems, Wozniacki came through for her 16th title

In Nice, Nicolas Almagro of Spain won his third title this year when he rallied past Victor Hanescu of Romania 6-7 (5), 6-3, 6-3 in the Open de Nice final on Saturday.

Almagro added to his consecutive titles in February in Costa do Sauipe and Buenos Aires to reach 10 in his career on the ATP Tour. He also made the final in Acapulco. Of his 31 wins on tour this season, 24 have been on clay.

In the final set against Hanescu, the third-seeded Almagro hit a backhand winner down the line to set up a break point that he converted with an inside-out forehand winner for a 4-2 lead.

Almagro slammed two aces in a row to win the match and complete the perfect preparation for the French Open that begins Sunday.

In the opening set, the unseeded Hanescu took Almagro's serve at 5-5 but Almagro cracked a crosscourt forehand winner in the next game to force a tiebreaker. Hanescu hit a forehand volley to earn a set point that he converted when Almagro netted a backhand.

Almagro cut his unforced errors in half from 20 in the first set to 10 in the second as Hanescu dropped serve in the fifth game by sending a backhand long. Almagro leveled at one set apiece on an unforced error from the 69th-ranked Hanescu.

The Spaniard improved to 4-0 against Hanescu.

In Strasbourg, France, Andrea Petkovic of Germany won her second career title on Saturday after her opponent, Marion Bartoli of France, retired while trailing 6-4, 1-0 in the final of the Strasbourg International.

The top-seeded Bartoli asked for a medical timeout at 5-4 to have her left thigh strapped, but a few games later she decided to pull out.

Bartoli may now be a doubt for the French Open, which begins on Sunday.

"I didn't want to win this way at all," Petkovic said.

"I hope Marion will be fine for the French Open because she plays very well and I think she could play very well in Paris." Petkovic double-faulted to drop the opening game, but she won five straight games to lead 5-2. The second-seeded German hit a drop shot to take the first set.

"I didn't play my best tennis at the start of the clay-court season," Petkovic said. "I think it's the right time to hit form. I'm very happy with my game at this moment." Petkovic won her first title in Bad Gastein, Austria, in 2009. Past winners of this event include Lindsay Davenport, Steffi Graf, Jennifer Capriati and Maria Sharapova.