Reigning world champion Kento Momota won his first Japan Open title on Sunday, beating Thailand's Khosit Phetpradab in straight games.
Japanese duo Yuki Fukushima and Sayaka Hirota also won their maiden championship in the women's doubles. Nozomi Okuhara settled for silver after losing to 2016 Rio de Janeiro Olympic gold medalist Carolina Marin of Spain in the women's singles.
World No. 4 Momota defeated No. 26 Phetpradab 21-14, 21-11 in the 48-minute match at Musashino Forest Sport Plaza, the venue for the 2020 Tokyo Olympic badminton competition.