World #1 Serena Williams clinched the year-end top ranking today
when World #1 Maria Sharapova
failed to win her match against Agnieska Radwanska
in straight sets (despite being a set and 5-1 up!) and therefore failed to exit the round-robin of the ETA Tour Finals in Singapore. Williams is the defending champion and although she, Ana Ivanovic
and Simona Halep
all won 2 matches and lost 1 in their group, only Halep and Williams advanced. In the other group, Caroline Wozniacki
is the only undefeated player and despite losing to Sharapova, Radwanska qualified for the semifinals.The results mean that Serena will play Wozniacki in ...