Six gold medals were decided on the opening day of the International Blind Sports Federation Judo World Championships in Odivelas.
Rio 2016 Paralympic champion Inna Cherniak was among the winners at the Pavilhão Multiusos de Odivelas in the Portuguese city.
She won the under-57 kilograms title at the Games in Brazil but came down in weights to win the world under-52kg crown today.
She saw off Ramona Brussig of Germany, who won Rio 2016 silver at under-52kg, to clinch the title.
Other winners in women's events included South Korea's Soohee Choi, who defeated Azerbaijan's Shahana Hajiyeva in the under-48kg final.
In under-57kg action, Turkey's Zeynep Celik came out on top against Japan's Paralympic bronze medallist Junko Hirose.
In men's action, Kazakhstan's Olzhas Orazalyuly won the under-60kg title as he beat Algeria's Ishak Ouldkouidier for gold.
Bayram Mustafayev upgraded his Rio 2016 silver to World Championship gold by beating Sid Ali Lamri of Algeria in the under-66kg final.
Uzbekistan's Feruz Sayidov, a Paralympic bronze medallist, won the under-73kg crown as he defeated South Korea's Seungjun Yang.
Seven more weight divisions will be contested tomorrow before a team event on Sunday (November 18).