Kento Momota of Japan lost to Chen Long of China in the semi-finals of the Badminton World Federation (BWF) French Open to knock the top seed out of the competition.
Olympic champion Chen beat world champion Momota 21-18, 21-8 at the Stade Pierre de Coubertin in Paris to progress to the final.
Momota had been looking for a second straight major title after winning the Denmark Open.
Chen will face compatriot Shi Yuqi after he won against Rasmus Gemke of Denmark 21-11, 21-16.
In the women's competition, top seed Tai Tzu Ying of Chinese Taipei came from one game down to beat Chen Yufei of China 18-21, 21-12, 21-14.
Tai will now play Akane Yamaguchi of Japan in the final.
Yamaguchi beat He Bingjiao of China 20-22, 21-19, 21-19 to progress.
The finals will take place tomorrow when the doubles events will also conclude at the BWF World Tour event.