Thailand's Pawina Thongsuk overcame the strong challenge of Russia's Natalia Zabolotnaia to win the women's 75kg weightlifting competition.
Both athletes finished with a world record-equalling total of 272.5kg but Thongsuk took gold because she weighed less than Zabolotnaia.
The Russian set a new world record of 125kg in the snatch, beating Thongsuk's mark of 122.5kg set moments earlier.
Zabolotnaia's compatriot Valentina Popova took bronze with 265 kg.
It was Thailand's second Olympic weightlifting gold after Thongsuk's compatriot Udomporn Polsak won the 53kg category.