WTA Finals: Serena Williams hits back

Serena Williams remains on course to win a third successive WTA Finals title after beating Caroline Wozniacki in a marathon semi-final in Singapore on Saturday. The American world number one fought back from a set down and a break in the decisive third set to win 2-6 6-3 7-6 (8/6) in two hours and 13 minutes..Williams, who beat Maria Sharapova to win the 2012 title and then overcame Li Na to clinch last year's crown, will meet either Simona Halep or Agnieszka Radwanska in Sunday's final at the Singapore Indoor Stadium.Wozniacki made a blistering start to the last-four encounter, holding serve twice after breaking Williams' opening service game to race into a 3-0 lead.Williams regained her composure, but, although she held her next two service games, Wozniacki did too.Williams' frustration boiled over in the seventh game when she smashed her racquet after missing a break-point chance and her Danish opponent poured salt in her good friend's wounds by then breaking to win the first set 6-2.

Force a decider

Wozniacki made a decent start to the second set and won her first two service games, but Williams drew on all her experience to break twice to win the set 6-3 and force a decider. All the American's hard work had seemingly gone to waste when Wozniacki broke to take a 5-4 lead and serve for the match, but the Dane could not close it out and the decider went to tie-break when both players held the subsequent service games.Williams sent down her 12th ace to set up match point and she duly sealed the win when Wozniacki had no answer for one of her trademark thunderous forehand ground strokes.