Canadian swimmer Kylie Masse has won gold in the women's 100-metre backstroke with a word-record time of 58.10 seconds at the world swimming championships.
Masse edged the previous long-course record of 58.12 seconds set by British swimmer Gemma Spofforth at the 2009 world championships in Rome.
Kathleen Baker of the United States was second in 58.58 seconds and Australia's Emily Seebohm was third in 59.59.
Masse's gold was Canada's first of the championships.
