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The 29-year-old, who reached a career high ranking of 16th in 2019, defeated Spain's former top-10 player Roberto Bautista Agut 7-6(5), 6-2 in the final.
Sania and her Slovenian partner Klepac lost 5-7, 6-2, 5-10 to America's Nicole Melichar and Dutch player Demi Schuurs in one hour and 28 minutes.
Sania and Klepac made short work of fourth seeds Anna Blinkova and Gabriela Dabrowski 6-2, 6-0 to reach the last four round.
Results 1-3
