Sania and her American partner Bethanie Mattek-Sands were forced to retire from their women's doubles pre-quarterfinals following a groin problem to the latter.
Sania and Bethanie, seeded seventh, had annexed the first set but the American encountered a groin issue in the second set and eventually they pulled out with the score reading 7-6 (0) 3-5 against 11th seeds Anastasia Pavlyuchenkova and Lucie Safarova.
Sania and Bethanie, who had encountered a back problem yesterday, had overcome American pair of Lauren Davis and Megan Moulton-Levy 1-6 6-3 6-0 in their second-round match.
Paes and Jankovic lost in one hour and 30 minutes.