Guangzhou: Indo-Swiss tennis combine of Sania Mirza and Martina Hingis comfortably entered the women's doubles semi-finals with a straight sets victory at the $250,000 Guangzhou Open here on Thursday.

The top seeds needed just an hour and five minutes to beat unseeded German-Romanian pairing of Anna-Lena Friedsam and Monica Niculescu 6-2, 6-3 in the quarter-finals, played on the centre court of the Guangzhou International Tennis Center.