World number 26 Kashyap, who had stunned top seed Chen Long to reach the quarterfinals yesterday, saw off Vittinghus -- ranked 16 -- 21-15 21-14 in a 39-minute men's singles match.
Kashyap will next take on seventh seed Indonesian Simon Santoso in the semifinals tomorrow. Santoso beat compatriot Dionysius Hayom Rumbaka 21-17 21-7 in another match.
The 25-year-old from Hyderabad, who qualified for the London Olympics during the India Open Super Series in New Delhi, matched his rival at the fore court and used his sharp smashes to tame Vittinghus.
Kashyap took early initiative and moved to a 10-6 lead. Vittinghus narrowed down the gap a couple of times but the Indian, with his 17 smash winners, was too good for the Dane.
In the second game, the duo fought tooth and nail till 9-9, before Kashyap once again moved ahead and held fort to earn his place at the semifinals.
