Defending their top billing, the Indo-Kazakh pair overcame their second seed opponents 6-3, 6-3 after one hour and five minutes struggle.
Sania paired with Yaroslava for this tournament since her regular Tour partner Elena Vesnina decided to skip the event.
She had triumphed at Indian Wells and Charleston with Vesnina and fell in the final of the French Open.
Sania and Yaroslova provided umpteen opportunities to their rivals but prevented damage by saving eight break chances in the second set.
The winners shared $11,000 and earned 280 ranking points each.