Olympic bronze medallist Saina, who had clinched the Swiss Open in 2011 and 2012, saw off Germany's Karin Schnaase 21-7 21-15 in 33 minutes to set up a meeting with Czech's Kristina Gavnholt at St Jakobshalle here.
Double World Championships bronze winner Sindhu, seeded sixth, sent Ireland's Chole Magee packing 21-19 21-10 in a 31-minute first round match. Sindhu face Pai Yu Po of Chinese Taipei in the pre-quarterfinals.
Made it to the
pre-quarterfinals after an easy win. The Indian, who had stunned former World No. 1 Lee Chong Wei of Malaysia in the opening round of the All England Championship last week, prevailed over Uzbekistan's Artyom Savatyugin 21-7 21-10 in a 21-minute match.
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He had beaten Switzerland's Mathias Bonny 21-14 13-21 21-6 in the opening round and will take on second seed Chou Tien Chen of Chinese Taipei tomorrow.
In the opening round, eleventh seed Ajay Jayaram thrashed Malaysia's Jiann Shiarng Chiang 21-8 21-17. He will face Japan's Kenichi Tago next.
Young Sameer Verma also continued to impress with a hard-fought 21-17 24-22 win over Denmark's Emil Holst. He will face the formidable Wang Zhengming of China in the next round.