Mayu Matsumoto (R)/Wakana Nagahara of Japan compete during the women's doubles final against Kim So Yeong/Kong Hee Yong of South Korea at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019. (Photos: Xinhua/Du Xiaoyi)

Mayu Matsumoto (Front)/Wakana Nagahara of Japan compete during the women's doubles final against Kim So Yeong/Kong Hee Yong of South Korea at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.

Kim So Yeong (L)/Kong Hee Yong of South Korea celebrate after the women's doubles final against Mayu Matsumoto/Wakana Nagahara of Japan at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.

Kim So Yeong (R)/Kong Hee Yong of South Korea pose for photos during the awarding ceremony after the women's doubles final against Mayu Matsumoto/Wakana Nagahara of Japan at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.

Kim So Yeong (L)/Kong Hee Yong of South Korea celebrate after the women's doubles final against Mayu Matsumoto/Wakana Nagahara of Japan at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.

Kim So Yeong (Front)/Kong Hee Yong of South Korea celebrate during the women's doubles final against Mayu Matsumoto/Wakana Nagahara of Japan at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.

Mayu Matsumoto (L)/Wakana Nagahara of Japan pose for photos during the awarding ceremony after the women's doubles final against Kim So Yeong/Kong Hee Yong of South Korea at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.

Kim So Yeong (L)/Kong Hee Yong of South Korea compete during the women's doubles final against Mayu Matsumoto/Wakana Nagahara of Japan at Japan Open 2019 badminton tournament in Tokyo, Japan, on July 28, 2019.