Sania, who is nursing multiple injuries, has 516.75 points.
After the recent Federation Cup at Seoul, where she played despite her injuries, Sania will be back in action just before the French Open championship to tune up for the clay court Grand Slam next month.
However, Shikha Uberoi slipped one place to 179 and the US-based player has 155 ranking points.
Ankita Bhambri moved three places to 332, while Isha Lakhani was at 363.
Among the men, Leander Paes lost five places to be on 14th while Mahesh Bhupathi maintained his 28th position in the doubles rankings.
In the top 10 list, Russian Nadia Petrova, who beat Justine Henin-Hardenne to clinch the German Open on Sunday, overtook compatriot Maria Sharapova at No. 3.
Amelie Mauresmo of France was atop the table followed by Kim Clijsters of Belgium.