DOHA, Qatar -- Top seeds Caroline Wozniacki and Vera Zvonareva notched round-robin victories Tuesday at the season-ending WTA Championships.
The top-ranked former U.S. Open runner-up Wozniacki waltzed past seventh- seeded Russian Elena Dementieva 6-1, 6-1 in a mere 53 minutes, while the 2010 U.S. Open and Wimbledon runner-up Zvonareva zipped past sixth-seeded former world No. 1 star Jelena Jankovic 6-3, 6-0 on the hardcourts at Khalifa Tennis Complex.
Wozniacki is 1-0 in the four-player Maroon Group, while Zvonareva is 1-0 in the White Group. Dementieva is 0-1 in the Maroon Group, while Jankovic is 0-1 in the White Group.
One other Day-1 Maroon Group bout saw fifth-seeded Samantha Stosur (1-0) top fourth-seeded Francesca Schiavone 6-4, 6-4 in a rematch of this year's French Open final, which was won by Schiavone (0-1) in upset fashion.
On Wednesday, Wozniacki will meet Stosur, Zvonareva will battle eighth-seeded Victoria Azarenka and third-seeded Kim Clijsters will encounter her fellow former world No. 1 Jankovic. Azarenka is fresh off her title in Moscow last week, while Clijsters is the reigning two-time U.S. Open champ and captured this season-ending event back-to-back in 2002 and 2003.
Wozniacki and Zvonareva are battling for the coveted year-end No. 1 ranking this week.
This prestigious event features the top-eight players in the world. Round- robin tennis will be the order of the day through Friday, as the top- two players from each group will advance to the semifinals on Saturday. The lucrative final will be staged on Sunday, with the winner pocketing at least $1.55 million.
Two of the world's top-eight performers are skipping the tournament, as No. 3 Serena Williams and her fifth-ranked sister Venus are sidelined with injuries. Serena was this year's Australian Open and Wimbledon champion and last year's WTA Championships titlist, having beaten her older sister in the finale here in Doha. Venus captured this event two years ago, as the Williams sisters accounted for the last two Championships champions. Serena also won this season-ending tournament back in 2001.