WTA Finals: Caroline Wozniacki defeats Petra Kvitova in Singapore

For the first time in four years, defending champion Caroline Wozniacki defeats Petra Kvitova with a 7-5 3-6 6-2 victory at the WTA Finals in Singapore.

The 28-year old Wozniacki, sealed the win in two hours and 19 minutes despite need for medical treatment on her knee during the second set. 

Her last win over the Czech fourth seed was at the 2014 WTA Finals.

Afterwards, Karolina Pliskova was defeated by Elina Svitolina 6-3 2-6 6-3.

The sixth seed Ukrainian hit eight aces and needed one hour and 54 minutes to sealed the victory over her Czech opponent, placing her top of the White Group standings with one round-robin match to come on Thursday.

Second seed Wozniacki took an early lead on her third set point after Kvitova had made 16 unforced errors.

In midway through the set, She asked for a physio after experiencing pain in her left knee, before the 28-year old Kvitova levelled the match in a set in which she secured four breaks of serve. 

Wozniacki broke shortly at the start of the deciding set and she capitalised on her opponent's fatigue to serve for the match.

"I am happy how I didn’t lose my cool," Wozniacki said.

"In the second set, I didn't think I played badly, she just played exceptionally good. I needed to refocus and keep doing what I was doing."

The WTA Finals consists of the leading eight players this year, divided into two groups of four.

The top two players from each round-robin group will progress to the semi-finals, with the final on 28 October.

For the fifth and final time, the Finals will be played in Singapore before changing the location to Shenzhen in China.