Young talent Tatsuru Saito claimed the men's heavyweight crown, while reigning Asian champion Sanshiro Murao won the men's 90-kg division as judo's World Masters wrapped up in Jerusalem on Thursday.
The 20-year-old Saito's victory over Tajikistan's Temur Rakhimov in the final match of the season-ending competition pushed Japan past France to the top of the medal table with three gold, two silver and four bronze.
Runner-up at October's world championships in Tashkent, Tatsuru Saito, the second son of the late two-time, 95-kg Olympic gold medalist Hitoshi Saito secured the title with ippon in the closing seconds at Pais Arena.
Japan's other over-100-kg representative, 2021 world champion Kokoro Kageura, ultimately took bronze via the repechage after a quarterfinal loss to Alisher Yusupov of Uzbekistan.
In the 90-kg final, the 22-year-old Murao scored a pair of waza-ari to defeat France's Alexis Mathieu. Japan's other judoka in the division, Grand Slam Tokyo winner Kosuke Mashiyama, lost his opening match to Czech David Klammert.
In the women's over-78-kg division, Olympic champion Akira Sone won bronze through the repechage following her quarterfinal defeat to Coralie Hayme, who claimed silver after losing an all-French final against Tokyo Games bronze medalist Romane Dicko.
Tokyo Games men's 100-kg champion Aaron Wolf made a surprise first-round exit against Romania's Asley Gonzalez, a former 90-kg Olympic runner-up and world champion for Cuba.
Japanese hope Rika Takayama was unable to secure the women's 78-kg bronze after losing her semifinal against France's Audrey Tcheumeo.
The World Masters is among the qualifying events for Japanese judoka seeking national team selection for next May's world championships in Doha.