Wozniacki targets Williams at ASB Classic

After a difficult year with injuries sparked rumours she would retire, Caroline Wozniacki is back and says she can beat Serena Williams in Auckland.

"We always have some hard battles," Wozniacki told the New Zealand Herald.

Williams has dominated the results between the pair, but the matches themselves are usually close battles.

"Unfortunately most of them Serena won, but it has been close. I hope it's my time to get out on top now," the Dane said.

The American has won 10 of their 11 encounters, but their first clash in Sydney in 2009 gave a taste of what was to come with the three-setter featuring two tiebreaks.

Four of their past seven matches have gone to three sets, with Wozniacki's only victory coming in a 6-4, 6-4 win in Miami in 2012.

There is a strong lineup set for Auckland next week, with Serena and Venus Williams, Ana Ivanovic and Sloane Stephens competing.

"I think the field is always strong here in Auckland," Wozniacki said. "This year is not any different. It gives a good possibility to be tested from the beginning of the year [by] some of the best players in the game. It must be unusual for an international level tournament."

The 26-year-old has a good record at the tournament. She was runner-up in 2015 and made the semi-finals in 2016.

However, she fell out of the top 50 in June for the first time in eight years after first-round exits at the Australian Open and Wimbledon and missed almost three months with an ankle injury, leading to speculation she might retire.

However, Wozniacki rebounded with a semi-final spot at the US Open and wins in Tokyo and Hong Kong. She is now ranked number 19 on the WTA tour.

"I never doubted myself," she said. "I had a bad injury that took me out of the game for quite some time. I wasn't feeling 100 percent comfortable coming back and was maybe lacking the last 5 or 10 percent. So I think it's normal to drop down a bit after an injury, but I always believe in myself and I know I can win against anyone on the tour."

"I [will] continue playing as long as I have fun playing tennis. Right now I'm enjoying my time on the court."