Top seeds Sania Mirza and Martina Hingis were knocked out of the French Open in the third round by the unseeded Czech pair of Barbora Krejcikova and Katerina Siniakova on Sunday. The Indo-Swiss pair lost in straight sets, 3-6 2-6. Hingis and Mirza were gunning for a non-calendar Slam after winning the women's doubles title at Wimbledon, US Open and the Australian Open.