However, French Open champion Anastasia Myskina's run of miserable form continued when she was beaten by Switzerland's Patty Schnyder.
Sania jumped 35 places to 99 in the latest world rankings.
On a day of upsets at the Pacific Life Open, Australian Open runner-up Marcos Baghdatis beat 7th seed Gaston Gaudio.
The two players were named as the top seeds for the men's and women's singles event at the Australian Open which starts on Monday.
The American ace celebrated her 700th singles victory by crushing the Russian 6-0, 6-0 to reach the quarter-finals of the Dubai Open.
Eighth seed Justine Henin-Hardenne fought back from a set down to topple the top seed and reach the semi-finals of the Australian Open.
The Belgian ace made the semi-finals of the Acura Classic along with Justine Henin-Hardenne and Lindsay Davenport.
The US Open champion beat the world number one in a hard-fought Champions Challenge final in Hong Kong.
Venus Williams will take on Lindsay Davenport while Serena Williams will duel with Jennifer Capriati.
Recuperating from a back injury, India's tennis ace Sania Mirza hangs on to 34th place in the latest WTA singles rankings released on Monday.
The American ace was assured the year-end top spot after world number two Kim Clijsters of Belgium was knocked out at the round robin stage at the WTA Championships.
Defending champion Maria Sharapova was forced to drop a set before beating Patty Schnyder in the season-ending WTA Championships.
The American ace has won all 10 semi-finals she played this season and never failed to reach the title match in Zurich in the six years she has played the event.
Davenport saved two match points to beat Hantuchova and reach the quarter-finals of the Zurich Open.
Former world number one Lindsay Davenport won her eighth consecutive match on the comeback trail by beating Russian Elena Dementieva 7-6, 6-1 to reach the semi-finals of the China Open on Friday
Venus Williams, who had advanced to the quarter-finals, pulled out of the China Open with a left knee injury
The 31-year-old American swept to a 6-2, 6-2 victory over Eleni Daniilidou at the Bali Classic.
Sharapova beat Lindsay Davenport while the defending champion beat Amelie Mauresmo in the women's singles semi-finals at Wimbledon.
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