Top Indian shuttlers Saina Nehwal, PV Sindhu and Parupalli Kashyap have reached singles quarterfinals of the Swiss Open Grand Prix Badminton tournament at Basel.In women's singles, Pre-quarter final match on Thursday, London Olympics bronze medallist Saina defeated Sashina Vignes Waran of France 21-7, 21-13 while Seventh seeded PV Sindhu beat Li Michelle of Canada 19-21, 21-16, 21-11.In Men's Singles pre -quarter final on Thursday, Parupalli Kashyap defeated Beryno Jiann Tze Wong of Malayasia 21-23, 21-9, 21-14.Saina Nehwal will take on Yihan Wang of China while PV Sindhu will face another Chinese shuttler Shixian wang in quarter finals on Friday.Parupalli Kashyap will meet Chinese Tapiei player Tien Chen Chou in Men's Singles quarterfinal on Friday.