Takahiro Nakai defeated world bronze medalist Masahiro Takamatsu in the men's 81-kg final while world champion Kaori Matsumoto prevailed over compatriot Nozomi Hirai in the women's 57 kg to win the Grand Slam Tokyo title on Sunday.
Host Japan won in four out of five weight categories, surprisingly finishing empty-handed in the usually dominant women's 63-kg class.
In the 81-kg final, neither man could gain any leverage throughout the bout but Nakai emerged the winner after judges penalized Takamatsu twice for passivity at Tokyo Metropolitan Gymnasium.