Lilly King of the United States won her showdown with Yulia Efimova after plenty of the bad blood between the two over the Russian's doping record.
After staring down Efimova in the ready room and giving her a look of disdain on the deck, King led all the way to take the gold with a time of 1 minute, 4.93 seconds.
Efimova, who heard a round of boos and a few cheers during the introductions, settled for the silver in 1:05.50. The bronze went to another American, Katie Meili, at 1:05.69.
King was critical of Efimova being allowed to compete in the Rio Games after serving a previous 16-month suspension for doping and testing positive again this year for the now-banned substance meldonium. Possible sanctions over a second violation were put on hold while WADA does more research on the drug.
King didn't acknowledge Efimova during a raucous victory celebration. Finally, as the two were picking up their credentials at the side of the deck, King gave her rival a quick pat on the shoulder.
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