Williams, Halep, Radwanska and Wozniacki are last four standing at WTA Finals Singapore

ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
(From left) World No. 1 Serena Williams, No. 4 Simona Halep, No. 6 Agnieszka Radwanska and No. 8 Caroline Wozniacki are left to contend for the Billie Jean King trophy. -- ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN
(From left) World No. 1 Serena Williams, No. 4 Simona Halep, No. 6 Agnieszka Radwanska and No. 8 Caroline Wozniacki are left to contend for the Billie Jean King trophy. -- ST PHOTOS: KUA CHEE SIONG, ONG WEE JIN

The field of eight top women's singles tennis players has been whittled down to four at the BNP Paribas WTA Finals Singapore presented by SC Global. With the completion of the round-robin matches yesterday, world No. 1 Serena Williams, No. 4 Simona Halep, No. 6 Agnieszka Radwanska and No. 8 Caroline Wozniacki are left to contend for the Billie Jean King trophy.