World No. 15 Prannoy recovered from a 6-11 deficit in the second game to oust local player Emil Holst 21-18 21-19 in a hard-fought match. It was his third win over the Danish shuttler.
The Indian is likely to play former World No. 1 Malaysian Lee Chong Wei tomorrow.
"It was a tough match. He is a tricky player and I have always played close matches against him. I was trying out a few things in the second game but it didn't work out. He got points and had a good lead. I was getting tired but I am happy to have won. Hopefully I will be better tomorrow," Prannoy told PTI.
In men's doubles, Satwik and Chirag Shetty, who had reached the quarters at Korea Open, failed to get across Korean pair of Chung Eui Seok and Kim Dukyoung, losing 21-14 18-21 17-21 in the opening round.
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Another mixed doubles pair of Pranaav Jerry Chopra and N Sikki Reddy, who had reached the semifinals at Japan Open, also crashed out last night in the opening round after losing 17-21 15-21 to Irish combo of Sam Magee and Chloe Magee.
"Today's match has been played by the service umpire and the chair umpire... well done guys #DenmarkOpen they just made me mentally down," Sikki wrote on her twitter handle.
"What ever rules they make there is of no use... there should be review system in the services that will be the best for the players," she tweeted.
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