The German (right), who now trails the Chinese superstar 5-3 in the head-to-head tally, appeared to be in for a hiding as Wang Shixian was in superb form in the opening match.
She, however, lost her way in the next two games as Schenk upped her performance to eventually walk away with a determined 6-21, 21-10, 21-16 victory on Friday.
Schenk later told the local media: “It was an amazing victory. The beginning was not that great. She had full control, I was struggling with my speed but I could change and found my rhythm and I stayed calm and finally it was even. I enjoyed the victory.
“We have been playing quite often this year as it is the Olympic qualification year. It's always a big challenge to play against her and I enjoyed this victory.
“There are many young spectators and they were cheering for me and it gives you extra spirit. It is the second time for me in India and I had good memories last time in Hyderabad during the world championship."
She will now face the latest star from China’s long assembly line of shuttlers with Chen Xiao Jia reaching the last four by beating South Korea’s Bae Youn Joo (left), 21-17, 21-13.
The other semi-final in this OSIM BWF World Superseries tournament will see second seed and two-time Asian champion Li Xuerui taking on fourth seed Jiang Yanjiao.
In the women’s doubles, defending champions Miyuki Maeda-Satoko Suetsuna (right), stayed on course to retain their title and for an all-Japan final when they defeated local favourites Jwala Gutta-Ashwini Ponnappa 19-21, 21-13, 21-14.
They will meet unseeded Chinese pair Bao Yixin-Zhong Qianxin, who upset top seeds Ha Jung Eun-Kim Min Jung 18-21, 22-20, 21-16.
Second seeds Mizuki Fujii-Reika Kakiiwa take on sixth seeds Jung Kyung Eun-Kim Ha Na Kim for a place in the final.
Indonesia’s Tontowi Ahmad-Liliyana Natsir are also through to the mixed doubles semi-finals as they set their sights on retaining their title they won in style last year.
For full results, click here.