An in-form Simona Halep stands between Serena Williams and a third successive WTA Finals crown after both players booked their place in Sunday's title decider in contrasting manner. Williams fought back from a set down and a break in the third set against Caroline Wozniacki to win 2-6 6-3 7-6 (8/6) in two hours and 13 minutes, while Romanian Halep needed just 67 minutes to despatch Agnieszka Radwanska 6-2 6-2. Williams and Halep will meet in Sunday's showpiece at the Singapore Indoor Stadium four days after Halep hammered the world number one 6-0 6-2 in a round-robin fixture, which prompted Williams to declare herself embarrassed.
@highlight
Serena Williams fought back from a set down to defeat Caroline Wozniacki in the semi-finals
@highlight
Romanian Simona Halep needed just 67 minutes to despatch Agnieszka Radwanska 6-2 6-2.
@highlight
Williams and Halep will meet in Sunday's showpiece at the Singapore Indoor Stadium
Caroline Wozniacki
Caroline Wozniacki
Williams regained her composure, but, although she held her next two service games, @placeholder did too.
Caroline Wozniacki
Caroline Wozniacki
@placeholder 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.
Simona Halep
Halep
Halep
Simona Halep
Halep
@placeholder then broke her opponent's first two service games in the second and held her own for another 3-0 lead before Radwanska finally registered in the second set by breaking her opponent at the sixth attempt.