The second-round win over world No 8 Martina Hingis at Korea Open last week helped Sania Mirza go up by four places to be at 55th spot on the latest WTA world rankings released on Monday.

Sania, who defeated Hingis 4-6, 6-0, 6-4 in a tough battle at Seoul, was at the 59th spot the previous week and the big win over the Swiss boosted the Hyderabadi to 428 points for the promotion.

Sania, who had a major slip in the rankings this year due to a string of forgettable performances, has the chance to regain her top ranking of World No 31. Interestingly, Sania held her career best ranking during October last year.

In the doubles rankings, the Indian ace has maintained her 26th place, which she achieved along with South African Liezel Huber after her Sunfeast Open win in Kolkata.

Among other Indian women on the WTA Tour, Shikha Uberoi (232 to 219), Ankita Bhambri (369 to 363) and Isha Lakhani (391 to 389) have registered rise in their rankings while Rushmi Chakravarthi (454 to 456) suffered a minor slide.