Williams had won all seven of her previous meetings with the sixth seed, but Wozniacki finally got the better of the veteran American to win 6-4 6-4 in Singapore on Monday (AEDT).

Wozniacki has taken her game to another level this week and produced another exceptional performance under pressure, ending the season with a huge victory to keep Williams waiting for a 50th WTA singles title.

The Dane, runner-up in this prestigious tournament seven years ago, was rewarded for an aggressive approach and although the evergreen Williams showed great character to claw her way back from 5-0 down in the second set, Wozniacki was able to finish off the job.