Tokyo: Australian swimmer Kaylee McKeown claimed the women's 100m backstroke gold in an Olympic record time of 57.47 seconds at the Tokyo Olympic Games here on Tuesday.
The result was 0.02 seconds behind her own world record, but enough for her to beat second-placed Kylie Masse of Canada, who finished in 57.72 seconds.
The bronze went to 19-year-old Regan Smith of the United States.
Lydia Jacoby of the United States won the women's 100m breaststroke in her Olympic debut on Tuesday.
The 17-year-old beat South African Tatjana Schoenmaker to second in the final sprint, clocking one minute and 04.95 seconds for the gold.
Schoenmaker, leading for the majority of time, had to settle for a silver in 1:05.22.
Olympic and world champion Lily King took the bronze in 1:05.54.