Simona Halep got off to a winning start at the WTA Finals in Singapore! Our player came out firing in her opener and got swift revenge against her US Open conqueror, Flavia Pennetta. She brushed aside the Italian 6 - love, 6 - 3 in just 71 minutes. In the same, Red Group, Maria Sharapova battled hard for nearly three hours to edge Poland's Agnieszka Radwanska in her first round robin match. The Russian finally closed it out, 4 - 6, 6 - 3, 6 - 4. Halep was a runner-up in Singapore last year, beating Serena Williams in the round robin before the World No.1 pegged her back in the final.