Russian top seed Musa Mogushkov was an early casualty in the men's under-66kg judo tournament today, losing in the first round to Azerbaijan's Tarlan Karimov.
Mogushkov was actually ranked number two in the world when he was selected for the Games ahead of the only man above him in the rankings, Alim Gadanov.
His defeat comes just a day after Russia had won their first Olympic judo gold medal as an independent nation in the under-60kg division through Arsen Galstyan.
The two fighters were level going into a period of golden score where Karimov countered a Mogushkov attack to land the decisive point.
Second seed Tsagaanbataar Khashbaatar of Mongolia made safe progress as he defeated Tu Kai-Wen of Taiwan with an identical counter (uchi-mata sukeshi).
In the women's under-52kg division, Kosovan Majlinda Kelmendi, fighting under the Albanain flag as her country is not recognised by the International Olympic Committee, progressed with a victory over Finland's Jaana Sundberg.
There was also early success for North Korea's An Kum-Ae and Germany's Romy Tarangul, who once appeared naked in Playboy.