New Delhi, Jan 27(Agencies): Indian badminton star Saina Nehwal suffered a shock defeat at the hands of Japanese Sayaka Sato in the second round of the Korean Open Series in Seoul on Thursday.

The world number four Indian, who looked rusty in her first round match against Tzu Ying of Chinese Taipei on Wednesday, lost 21-17 19-21 11-21 to Sayaka in 53 minutes in the women's singles.

P Kashyap also became a second round casualty after losing 16-21 13-21 to third seed Peter Hoeg Gade of Denmark in 38 minutes in men's singles.

Jwala Gutta and V Diju also tasted defeat at the hands of sixth seeded Chinese pair of Tao Jiaming and Qing Tian, losing 16-21 13-21 within half an hour in the mixed doubles category.

Saina, who missed on-court action for more than a month due to a ligament injury in her right knee, relied on her powerful smashes but Sayato played better at the nets to run away with the match.

The 20-year-old Indian had her nose ahead after the first game, which she won 21-17 but Sayato bounced back after wresting the second game at 21-19 and then kept the pressure on Saina, whose game crumbled.