Koharu Yonemoto and Shiho Tanaka claimed the women's doubles title at the World Super Series Final on Sunday, when they defeated world silver medalists Yuki Fukushima and Sayaka Hirota in an all-Japanese final.
Yonemoto and Tanaka dominated their 21-16, 21-15 win over the national champions in 57 minutes at Hamdan Sports Complex.
The winners, who attended the same high school in Aomori Prefecture, became the country's first women's doubles champs at the Final since Rio de Janeiro Olympic gold medalists Ayaka Takahashi and Misaki Matsutomo claimed the title in 2014.
"I'm really happy. They are a persistent pair," Yonemoto, 27, said. "We wanted to remain poised while we played."
The 25-year-old Tanaka added, "We've lost to them a lot, so I wanted to defeat them in a very important match."
Earlier in the day, Akane Yamaguchi defeated India's Rio Olympic silver medalist Pusarla V Sindhu 15-21, 21-12, 21-19 in the women's singles final and earned her first title in the season-ending tournament.