Australia’s Kaylee McKeown edged American Regan Smith to win gold in the women’s 100-meter backstroke final Tuesday at the swimming world championships in Singapore, a blistering-fast edition of the rivalry between two of the best in the sport.

Five-time Olympic gold medallist Kaylee McKeown sets up a showdown with rival Regan Smith, while Australian teammate Alex Perkins climbs the podium in Singapore.

On the third night in Singapore, Kaylee McKeown reclaimed the 100 backstroke title. The 24-year-old touched the wall in 57.16 to clock the second fastest time in history. She was followed by her long-time in-pool rival,