Caroline Wozniacki of Denmark is congratulated by Agnieszka Radwanska of Poland during their WTA Finals singles tennis match at the Singapore Indoor Stadium October 23, 2014.[Photo/Agencies]

SINGAPORE - Denmark's Caroline Wozniacki moved closer to a place in the semifinals at the WTA Finals by beating Agnieszka Radwanska 7-5, 6-3 on Thursday.

Showing no signs of fatigue after her exhausting three-set win over Maria Sharapova two days earlier, Wozniacki rebounded from a slow start to overrun Radwanska with an ominous display.

Wozniacki nails down Sharapova in WTA Finals

Wosniacki, with two wins from two matches in Singapore, will be assured of a semifinal berth if Sharapova beats Petra Kvitova in the later White Group match.

The match began with four breaks of serve in the opening five games, and Wozniacki broke again in the penultimate game to take a hard-fought first set that lasted an hour and seven minutes.

After a break each, the second set was evenly poised until Wozniacki broke in the seventh game for a 4-3 lead, held serve and then broke again to end it.

Wozniacki went all the way to the final in 2010 when she was ranked number one in the world but failed to qualify in each of the next three years as her game started to unravel.

The 26-year-old has seen fortunes turn around in recent months, however, since splitting with her fiance, Northern Irish golfer Rory McIlroy.

Seemingly rejuvenated, she reached the final of the US Open in New York for the second time to qualify for the lucrative WTA finals.

Sharapova and Kvitova were due to square off later on Thursday with both needing a win to stay in contention for the semi-finals.

World number one Serena Williams was scheduled to meet Eugenie Bouchard in the feature night match, just 24 hours after she suffered her heaviest in 16 years against pint-sized Romanian Simona Halep.