Teenage sensation Sania Mirza [ Images ] has jumped up by 20 places to move to a career-best 77 in the latest WTA Tour tennis rankings following her quarterfinal appearance in the Dubai [ Images ] Open.

Sania, who defeated much higher ranked opponents including US Open [ Images ] champion and world's number six Svetlana Kuznetsova [ Images ] in the Dubai Open meet, took her points tally to 472 to reach the 77th spot in world ranking, the latest WTA rankings said on Sunday.

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Sania, 18, starting the week on the 97th place, got the better off seventh ranked Jelena Kostanic in the first round before accounting for Kuznetsova for a place in the quarterfinal. The Indian, however, lost the quarterfinal match to Jelena Jancovic in straight sets.

There were no changes in the rankings of the top four players -- Lindsay Davenport [ Images ], Amelie Mauresmo [ Images ], Maria Sharapova [ Images ] and Serena Williams [ Images ].