Ace shuttler Saina Nehwal [ Images ] emerged India's [ Images ] lone survivor at the Japan [ Images ] Open after defeating Mingtian Fu of Singapore in straight games, in Tokyo, on Thursday.

The fourth seed took 33 minutes to register a 21-17, 21-16 victory and enter the quarter-finals, where she will take on Juan GU of Singapore on Friday.

Commonwealth Games [ Images ] bronze medallist P Kashyap also played his heart out but went down 15-21, 21-6, 18-21 to sixth seed Jin Chen in a men's singles match that lasted for 66 minutes.

Ajay Jayaram, who stunned World No 7 Tien Minh Nguyen on Wednesday, was also a second round casualty, losing 20-22, 16-21 to Indonesia's Simon Santoso in 42 minutes.

Commonwealth Games gold medallist Jwala Gutta [ Images ] and Ashwini Ponnappa also bowed out, failing to get past seventh seeds Jung Eun Ha and Min Jung Kim of Korea in the women's doubles event.

The Indian duo lost 9-21, 21-18, 22-24 in 49 minutes.

The Indian mixed doubles pair of Jwala and V Diju also lost their second round match 15-21, 10-21 to the fifth seeded pair of Hung Ling Chen and Wen Hsing Cheng in just 24 minutes.

The 21-year-old Saina did well to keep the tricolour fluttering at the Tokyo Metropolitan Gymnasium.

In the first game, she opened up a narrow 9-5 lead, and though Mingtian caught up with her at 14-all, the Indian held firm to take the game.

In the second game, Mingtian dominated initially and had her nose ahead at 6-4, but Saina drew parity at 13-all and broke away at 15-15, scoring six straight points to seal a place in the quarter-finals.