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Perkovic, who is unbeaten this year, had fouls in the first two rounds to risk elimination but her only legal throw in round three was good enough to secure gold.
France's Melina Robert-Michon threw a national record 66.73m to take the silver.
Cuban Denia Caballero, the 2015 world champion, got the bronze with 65.34m.
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Croatia's Sandra Perkovic retained her Olympic discus title in Rio with a best throw of 69.21m.