SINGAPORE - OCTOBER 18:  L-R   Agnieszka Radwanska of Poland,Caroline Wozniacki of Denmark,  Ana Ivanovic of Serbia,Serena Williams of the USA and Simona Halep of Romania walk from the Marina Bay Sands hotel to the draw ceremony prior to the start of the BNP Paribas WTA Finals at Singapore Sports Hub on October 18, 2014 in Singapore.  (Photo by Clive Brunskill/Getty Images)