Russia's Natalia Vorobieva stunned Stanka Zlateva Hristova to take gold in thrilling style in the women's 72kg Freestyle Wrestling division.
Hristova is a five-time world champion and also claimed silver at Beijing 2008, but she was denied Olympic gold again thanks to an impressive performance from three-time junior world champion Vorobieva.
The 21-year-old lost the first period after being pushed off the mat but came back to pin her opponent - a rarity in Wrestling - in the second to seal a shock victory.