There was little to chose between both fighters as the contest was settled in golden score, when An, the 2008 Olympic silver medallist, landed a Yuko with a leg sweep.
France's Priscilla Gneto came through the repechage to claim bronze after beating Belgian Ilse Heylen, as did defeated semi-finalist Italian Rosalba Forciniti, awarded victory by judges' flag decision over Marie Muller of Luxembourg.
The shock of the day came early in the competition.
Beijing 2008 bronze medallist and reigning world champion Misato Nakamura had been given a bye to the second round, but was sent crashing out by An.
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