Istanbul, Turkey - Third-seeded Wimbledon champion Petra Kvitova and fourth-seeded Victoria Azarenka will meet in the final at the season-ending $4.55 million WTA Championships.

Kvitova battled back from a set down to beat U.S. Open champion Samantha Stosur 5-7, 6-3, 6-3 on the indoor hardcourts at Sinan Erdem Dome.

Kvitova, who posted a perfect 3-0 mark in the Red Group, is the first Czech to reach the final here since Jana Novotna won the title in 1997.

The 21-year-old Kvitova has won five titles this year: Brisbane, Paris [Indoors], Madrid, Wimbledon and Linz.

Kvitova is making her Championships debut. The last time a player reached the final of the year-end finale on her debut was in 2004, when Maria Sharapova -- also that year's Wimbledon champion -- did it.

Stosur went 2-1 in the White Group and fell to 0-3 lifetime against Kvitova.

Azarenka handled sixth-seeded Russian Vera Zvonareva 6-2, 6-3 to secure her spot in Sunday's final.

Azarenka won the White Group with a 2-1 mark, while Zvonareva went 1-2 in the Red Group.

The 22-year-old Azarenka is the first Belarusian to reach the WTA Championships singles final.

Azarenka is 3-1 in title matches this season.

Kvitova holds a 3-2 career mark against Azarenka.

The 2011 WTA Championships winner will collect $1.75 million.