Oct. 31, 2009 (United Press International) -- Sisters Serena and Venus Williams meet Sunday in the season-ending Sony (NYSE:SNE) Ericsson (NASDAQ:ERICY) women's tennis Championships in Doha, Qatar.

The matchup was determined Saturday when third-seeded Svetlana Kuznetsova beat fellow Russian Elena Dementieva, the fifth-seed, 6-3, 6-2 on the final day of round-robin play.

Both Kuznetsova and Dementieva went 1-2 in Maroon Group matches, but Venus Williams, the seventh seed and defending champion, advanced by winning more sets in the first four days.

Serena, the second seed, beat Denmark's Caroline Wozniacki, the fourth-seed, 6-4 1-0 when Wozniacki retired because of a left abdominal strain.

Wozniacki also was hampered by a leg injury throughout the week.

"It's so good to see a face like hers on the tour," Serena said. "She's an incredible fighter."

If Serena (3-0) wins Sunday's final, she would make $1.55 million for being unbeaten the entire event.