Indian shuttlers Saina Nehwal and PV Sindhu Wednesday marched into the second round of the women's singles event of the Denmark Open Super Series Premier. Saina was made to work hard for her 12-21, 21-10, 21-12 win over Germany's Karin Schnaase. Sindhu registered a 21-12, 22-20 victory over Hong Kong's Pui Yin Yip at the Odense Sports Park.