The unseeded Indo-Kiwi combination had started poorly as they lost the first couple of sets to Julio Peralta of Chile and Argentina's Horacio Zeballos.
But Sharan and Sitak made a superb comeback, winning the next three sets to carve out a 6-7, 4-6, 6-3, 7-6, 6-4 victory in a gruelling contest which lasted for three hours and 22 minutes.
They will face Jonathan Erlich of Israel and Marcin Matkowski of Poland in the next round.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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