HONG KONG (REUTERS) - Fifth seed Caroline Wozniacki ousted defending champion Jelena Jankovic 6-3, 6-4 in the semi-finals of tennis' Hong Kong Open on Saturday.

The 26-year-old Wozniacki will play Kristina Mladenovic in the final on Sunday after the Frenchwoman beat Australian youngster Daria Gavrilova 7-5 6-3.

Denmark's Wozniacki, who is yet to lose a set in the tournament, struggled to hold serve in the opening stages but held her nerve to break Jankovic's serve five times and come out on top in a battle between two former world No. 1s.

Wozniacki, who won the Pan Pacific Open last month, will look to secure her second Tour title of the year.

Gavrilova defeated world No. 1 Angelique Kerber on Friday, but the 22-year-old was brought back down to earth by the unseeded Mladenovic.

Mladenovic will be bidding to win her first significant singles title on Sunday but will need to record her first victory over Wozniacki, who has won both their meetings.