Serena Williams began her WTA Finals title defence on a winning note, seeing off Serbia’s Ana Ivanovic 6-4 6-4 in the first match of the 2014 season-ending campaign in Singapore.
The two-time defending champion is joined at the top of the Red Group standings by rising star Simona Halep, who beat Canada’s Eugenie Bouchard 6-2 6-3 later on Monday.
The No. 1-ranked American extended her winning run at the WTA Finals to 16 matches while it was Halep’s first win at the WTA finals.
World number 5 Bouchard is now expected to win both her remaining group matches- against Williams and Ivanovic to advance to the semi-finals.
Maria Sharapova faces US Open finalist Caroline Wozniacki while Wimbledon champion Petra Kvitova take on Agniesza Radwanska in the White Group on Tuesday.