It was a mixed day for India at the Japan Open as four shuttlers, including Saina Nehwal reached the second round, while others bowed out of the singles events of the Super Series badminton tournament in Tokyo today.World No. 1 Saina eked out a close 21-14 22-20 win over Thailand's Busanan Ongbumrungpan in the women's singles and the second seed will next take on Japan's Minatsu Mitani, an opponent against whom the Indian has a 5-2 record.Commonwealth Games champion Parupalli Kashyap was handed a win by Japan's Takuma Ueda after he retired midway due to a back injury at 3-2 in the men's singles opening game.He will next take on compatriot Kidambi Srikanth, seeded third, who beat Ireland's Scott Evans 21-18 21-15 in another men's singles match. H S Prannoy also notched up a thrilling 23-21 22-20 win over Wong Wing Ki Vincent of Hong Kong.He will next square up against Korea's Lee Dong Keun. However, it turned out to be a disappointing day for other Indians, including P V Sindhu, Ajay Jairam, B Sai Praneet, women's doubles pair of Jwala Gutta and Ashwini Ponnappa.