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Caroline Wozniacki of Denmark poses with the winner's plate after beating Naomi Osaka of Japan at the Japan Pan Pacific Open tennis tournament in Tokyo. Image Credit: AP/PTI

Tokyo, Wuhan: Former world No. 1 Caroline Wozniacki overpowered Japan’s Naomi Osaka 7-5, 6-3 to capture the Pan Pacific Open on Sunday, her first tournament victory since February 2015.

The Dane, who has battled back from a wretched run of injuries this year, weathered an early storm from her teenage opponent before running out a comfortable winner, claiming a second Tokyo title and the 24th of her career.

“I’m very proud to win the tournament,” Wozniacki told reporters.

“Somebody just told me I’ve won a tournament every year since 2008. That’s a nice little streak and hopefully I can keep it going and keep moving forward.”

Meanwhile, Roberta Vinci downed Olympic gold medallist Monica Puig in the first round of the Wuhan Open on Sunday.

Italy’s Vinci took just one hour and 20 minutes to defeat the Puerto Rican in two sets, 6-3, 6-3.

Last year’s US Open finalist Vinci — who was responsible for halting Serena Williams’ bid for a rare calendar-year Grand Slam — served eight aces en route to the second round of the $2.6 million hard court event.

Puig had a fairy-tale run at the Rio Olympics clinching her island nation its first ever gold medal — and taking her to a career-high ranking of 33.

Newly minted world No. 1 Angelique Kerber warned on Sunday that Serena Williams will come back strong after the German stripped her of her long-held position atop the rankings.

“I am sure that she (Williams) will (be) coming back strong,” Kerber told AFP in Wuhan, China.

Williams was gunning for her 23rd Grand Slam title at the US Open — that would have taken her past the record she shares with Steffi Graf — when she was cut down by 11th-ranked Karolina Pliskova in the semis.

The Czech’s victory ensured that Kerber, who had been snapping at Williams’ heels for weeks, would rise to number one.

The German then went on to beat Pliskova in the final to claim her second Grand Slam title of the year.

Williams’ slip from the number one spot in September also denied her a second record: the American veteran had topped the rankings for 186 weeks — a run Graf also matched.

And that double slight is sure to motivate Williams’ to come back strong, said Kerber.

“She will try to win some more Grand Slams and write history for sure,” she said.

Wozniacki, the Pan Pacific champion six years ago, survived a health scare after dropping serve to go down 4-3 in the first set.

After feeling a twinge in her left thigh, she left the court for treatment and returned with her leg heavily bandaged.

But it appeared to have little adverse effect as Wozniacki took complete control, ripping a fierce backhand down the line to take the set.

Wozniacki, who reached the US Open semi-finals earlier this month to signal her return to form, roared into a 5-0 lead in the second set as Osaka’s game unravelled in the Tokyo sunshine.

Playing with the roof open after a week of typhoon rains, Osaka paid for her youthful exuberance, her strategy of attempting to hit the fur off the ball on every shot backfiring badly against a vastly more experienced opponent.

The 18-year-old, who called a medical timeout of her own for a sore right shoulder after losing the first set, produced some spirited resistance to avoid the dreaded ‘bagel’, but it was too little too late.

Wozniacki completed victory with a crisp backhand which forced Osaka into yet another wild shot, giving the 26-year-old her first title since Kuala Lumpur last year.

“I hurt my groin a little bit in the first set, but I tried to stay aggressive and stay calm,” said Wozniacki, who had seen her world ranking plunge to 74th after suffering wrist and ankle injuries.

“To be honest I was just trying to fight for every point. It was tough at the end but I was just happy to close it out.”

The Dane is set to climb to 22 or 23 in the new rankings when they are released on Monday.

Osaka, born of a Japanese mother and Haitian father, will break into the top 50 after her fairy tale run but confessed her inexperience had cost her.

“Everything is a bit new to me,” she said. “I was thinking too much about the whole situation. When she took a medical break I should’ve been more focused on my game.

“I’m sort of taking everything as it comes,” added Osaka, who had lost all her previous five finals on the WTA satellite circuit.

“I will try to fix things I did wrong today but honestly I’m happy how I’ve played this year.”