Sania Mirza's campaign in the Australian Open ended on Wednesday after she and her Czech partner Renata Voracova crashed out of the women's doubles event.Indo-Czech duo lost in straight sets to top seeds Gisela Dulko and Flavia Pennetta in the opening round in Melbourne on Wednesday.Argentina's Dulko, who is the World Number one in doubles and her World Number two Italian partner Pennetta, outplayed the Indo-Czech duo 6-4 6-1.