Top Indian shuttlers P V Sindhu and Parupalli Kashyap suffered heart breaking defeats in the semifinals of the Grand Prix Gold badminton tournament.World championship bronze medallist, Sindhu, who had stunned All England Champion Shixian Wang in the quarterfinals, got drubbing from the Chinese shuttler Sun Yu 21-18 12-21 19-21 in a 79-minute women's singles match.Kashyap, too slumped to a 17-21 11-21 loss to world number 27 China's Houwei Tian in a 42-minute men's singles match. Kashyap had booked the semifinal berth with a hard-fought 21-15 21-23 21-18 win over sixth seed Tien Chen Chou of Chinese Taipei