Prannoy, who regained his career-best ranking of World No 12 that he had achieved in June two years ago, took just 31 minutes to see off Vittinghus 21-11 21-12 to set up a clash with 2016 Australian Open finalist Jeon Hyeok-jin of Korea.
"Good win against Vittinghus last night to advance to the Quarterfinals!! Tricky one awaiting later in the evening," Prannoy tweeted after the match.
The Indian had lost to the World No 31 Jeon in the Canada Open in a close match this year.
Young Indian doubles pair of Satwiksairaj Rankireddy and Chirag Shetty, meanwhile, notched up a stunning win over World No 6 Danish combo of Mads Conrad-Petersen and Mads Pieler Kolding to reach their second quarterfinal of the season.
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The World No 32 Indian pair, who had reached the quarters at Korea Open, dished out a superb performance to shock the 2016 European champions Conrad-Petersen and Kolding 22-20 12- 21 21-19 in a match that lasted an hour.
The Indian pair will square off against another Danish pair of Mathias Boe and Carsten Mogensen, who are the 2012 London Games silver medallists.
In the quarterfinals, newly-crowned Denmark Open champion Kidambi Srikanth will face fourth seeded Chinese Shi Yuqi, who had reached the finals at All England Championship in March this year.
Srikanth, who jumped to World No. 4 yesterday, has a 2-0 record against the Chinese with both the victories coming this season at Singapore and Australia.
However, the Indian will look at her World Championship win over the Chinese for inspiration as she looks to break the 2-2 deadlock.
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