SOFIA, Oct. 30 (Xinhua) -- Caroline Wozniacki of Denmark, Roberta Vinci of Italy and Tsvetana Pironkova of Bulgaria won the first matches of the women's tennis Qatar Airways Tournament of Champions here on Tuesday evening.

In the "Serdika" group at the beginning round, where the players face each other, Wozniacki defeated Hsieh Su-Wei of Chinese Taipei 6-2, 6-2, while Vinci smashed Daniela Hantuchova of Slovakia 6-1, 6-2.

In the other, "Sredets" group, hosts favorite Pironkova beat Zheng Jie of China 2-6, 6-4, 7-6 (4).

In the three matches on Wednesday, Russians Nadia Petrova and Maria Kirilenko will face Zheng and Pironkova respectively in the "Sredets" group, while Wozniacki will meet Vinci in the "Serdika" group.

The first two from each group will play in the semifinals on Saturday and the winners will play Sunday's final.

The tournament meets six players who have captured at least one International Series tournament title during the year, and who are not participating in singles at the Women's Tennis Association (WTA) Championships in Istanbul, along with two wildcards.