Romania’s Simona Halep beat Agnieszka Radwanska 6-2 6-2 on Saturday to set up a WTA Finals title match against world No.1 Serena Williams in Singapore.

The world No.4 was never troubled by the Pole and, on Sunday, will try to win two matches in a row against Williams, after belting her 6-0 6-2 in the group stage earlier this week.

In Saturday’s first semi-final, the American two-time defending champion needed a third-set tiebreaker to beat Caroline Wozniacki and advance to the decider.

Williams posted her fourth win of the year against the eighth-ranked Danish player 2-6 6-3 7-6 (8-6) and remains on course for a third-straight title in the season-ending championships.

Wozniacki served for the match at 5-4 in the third set but Williams broke back and prevailed in the tiebreaker on her third match point after trailing 4-2.

Williams has won 10 of 11 matches against Wozniacki, including this year’s US Open final and two other 2014 matches in which she recovered from a set down.