(REUTERS) - Caroline Wozniacki continued to build on her WTA Finals victory late last year with another impressive performance on her way to a 6-2, 6-2 victory over Croatia's Petra Martic to reach the quarter-finals of the Auckland Classic on Wednesday (Jan 3).
The world No. 3 ended 2017 with the biggest title of her career in Singapore and returned a day after thrashing Madison Brengle in her season opener to hit 21 winners against eight unforced errors in the 53-minute win over Martic.
"I'm trying to stay aggressive," the Dane said in a court-side interview. "I still made some unforced errors. It's taking a few matches to play like 100 per cent but I still felt I played pretty well today."
The top seed started brightly with a break of serve to love on her way to an early 3-0 lead and added another break in the eighth game to wrap up the opening set in just 24 minutes on a glorious day in New Zealand's largest city.
Martic tried to mount a comeback early in the second when she broke for a 2-0 lead but Wozniacki won the final six games behind impressive serving numbers, including six aces, to book a last eight encounter with American Sofia Kenin, 19.
"I've worked on everything I need to work on in the off-season," Wozniacki added as she continues her preparations for the Australian Open starting in Melbourne on Jan 15.
"Now it's just a matter of working out how to incorporate that into your match or into a situation where you maybe get nervous."
Kenin, a wild card, knocked out compatriot Varvara Lepchenko 6-4, 7-6(8/6) earlier in the day and there were also victories for Taiwan's Hsieh Su-wei and Barbora Strycova.
Hsieh recorded a 6-4, 6-3 triumph over Belgian qualifier Ysaline Bonaventure to set up a quarter-final clash against Strycova after the third seeded Czech edged out Sweden's Johanna Larsson 6-1, 6-7(7/3), 6-2.
In the late matches, second seeded German Julia Gorges eased to a 6-4, 6-0 victory over Slovakia's Viktoria Kuzmova to book a last eight tie against Slovenia's Polona Hercog, who was almost as ruthless in a 6-4, 6-2 win over Kirsten Flipkens.
Former world No. 2 Agnieszka Radwanska continued her strong start to the campaign with a 6-3, 7-5 win over American Taylor Townsend, the Pole holding her nerve in a tight second set that lasted more than an hour to advance.
Fourth seed Radwanska, who remains on a collision course for a semi-final against Wozniacki, next faces American qualifier Sachia Vickery, who defeated Paraguay's Veronica Cepede Royg 6-2, 6-4.