The unseeded Indo-Romanian pair shocked their fifth seed rivals 6-3, 1-6, 10-6 in the second round of the USD 2,000,000 hard court event.
They had earlier beaten local pair of Melanie Oudin and Jamie Hampton 6-4, 7-6 in the opening round.
They will next take on the winners of the match between Kveta Peschke/ Katarina Srebotnik and Maria Kirilenko/Victoria Azarenka.
Sania had failed to make the singles main draw after losing the first round of the qualifying event to 16th seed Serbian Bojana Jovanovski.
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