Indian shuttlers Saina Nehwal, Kidambi Srikanth and HS Prannoy entered the second round, while B Sai Praneeth and Satwiksairaj Rankireddy were eliminated in the opening round of the Denmark Open World Superseries Premier on Wednesday.
Hyderabadi Saina, 27, ousted Olympic 2016 champion and two-time world champion Carolina Marin of Spain with a 22-20, 21-18 victory in 46 minutes.
With this win, London Olympics bronze medallist Saina has taken a 5-4 lead in head-to-head record against the 24-year-old Spaniard.
Men's singles eighth seed Kidambi Srikanth eliminated compatriot Subhankar Dey with a 21-17, 21-15 victory in 35 minutes.
Joining Srikanth in the second round was Prannoy, who beat Danish Emil Holst 21-18, 21-19 in 48 minutes.
Satwik lost both in the men's doubles and mixed doubles. He partnered Ashwini Ponappa in the mixed doubles and they lost to Niclas Nohr and Sara Thygesen 19-21, 17-21 in 39 minutes.
Satwik and Chirag Shetty then lost to South Koreans Chung Eui Seok and Kim Dukyoung 21-14, 18-21, 17-21 in 56 minutes.
Danish Hans-Kristian Solberg Vittinghus defeated Praneeth 21-10, 21-15 in 39 minutes.
Indian men's doubles pair of Manu Attri and B. Sumeeth Reddy were humbled by Danish sixth seeds Mads Conrad-Petersen and Mads Pieler Kolding, who won 21-13, 21-18 in 35 minutes.