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Sofia, Bulgaria (Sports Network) - Former world No. 1 Caroline Wozniacki went 3-0 in her round-robin matches this week and will play in Saturday's semifinals at the $750,000 Tournament of Champions.

The top-seeded Danish star overcame seventh-seeded Slovakian veteran Daniela Hantuchova 3-6, 7-6 (7-4), 6-4 on the indoor hardcourts at Armeets Arena. The winless Hantuchova is now 0-2 in round-robin play heading into Friday.

Wozniacki captured this week's four-player Serdika Group.

Meanwhile, second-seeded Nadia Petrova moved to 2-0 with a 3-6, 7-6 (7-4), 6-3 comeback victory against third-seeded fellow Russian Maria Kirilenko (1-1) and fourth-seeded Italian Roberta Vinci (1-1) is currently battling fifth-seeded Taiwanese Su-Wei Hsieh (0-1) in the Day-3 nightcap.

On Friday in Sofia, Petrova will take on eighth-seeded Bulgarian crowd favorite Tsvetana Pironkova (1-1), Kirilenko will encounter sixth-seeded Chinese Zheng Jie (0-2), and Hsieh will meet Hantuchova.

The Tournament of Champions is the finale for the WTA's International Series, with the six highest-ranked players who have won an International title this year -- and two wild cards -- comprising an eight-woman field. The aforementioned Serdika Group boasts Wozniacki, Vinci, Hsieh and Hantuchova, while the four-player Sredets Group features Petrova, Kirilenko, Zheng and Pironkova.

The tournament format sees two round-robin groups play out over the first four days, with the semifinals on Saturday and the final on Sunday.