Akane Yamaguchi and Kenta Nishimoto both suffered straight-games defeat Sunday in the women's and men's singles finals, respectively, at the French Open Superseries badminton tournament.

Fifth-seeded Yamaguchi was brushed aside by Tai Tzu-ying in 31 minutes at Stade Pierre de Coubertin, the top seed and world No. 1 from Taiwan claiming a 21-4, 21-16 victory for her fourth Superseries title of the year.

"I couldn't react well to my opponent's attacks and strategies. I kept allowing her to make the first move," said Yamaguchi, who entered Sunday's game with a 4-4 head-to-head record against Tai.