World number three Saina defeated Belaetrix Manuputi of Indonesia 21-16 21-11 in a 34-minute women's singles match at the National Indoor Arena here. The 22-year-old will next take on sixth seed Chinese Shixian Wang later in the day.
London Olympics quarterfinalist Kashyap notched up a stunning 21-18 21-12 victory over world number six Kenichi Tago in the men's singles prequarterfinals. He had lost to the Japanese in the China Open in 2011.
The Commonwealth Games bronze-medallist Indian will next take on second seed Chen Long of China. The Indian had lost thrice to Long but in their most recent encounter at the Indonesia Open last year, the Kashyap had an upperhand.
World number 16 Sindhu suffered a 17-21 14-21 loss to fourth seed Juliane Schenk of Germany in a 39-minute women's singles match here, while World number 43 Sourabh fought hard before going down 19-21 19-21 to number eight Vietnamese Tien Minh Nguyen.