Misaki Matsumoto and Ayaka Takahashi put Japan in line for their first medal at the Olympic badminton by defeating South Korea's Jung Kyung-eun and Shin Seung-chan to reach the final of the women's doubles on Tuesday.
The top-ranked pair defended brilliantly against the world No. 5 Koreans and were too strong at the net in the 21-16 21-15 win at the Riocentro.
The Japanese will play the winner of China's Tang Yuanting and Yu Yang and Denmark's Christinna Pedersen and Kamilla Rytter Juhl in the final on Thursday.