Duffy went into the final stage — a traditional sprint over a 750-metres swim, 20-kilometres bike and 5km run — with a 14-second lead over Zafares after two strong performances in the first two events on Friday.
She completed the first event, a time-trial of 7km bike, 2km run and 200 metres swim, with a 32-second lead over Kirstin Kasper, also of the US, while Zaferes was a further six seconds back in third.
The afternoon featured a seven-stage event of a 2km run, 375-metre swim and 10km bike before competitors tackled the courses a second time, finishing with a 1km run. Duffy’s lead was cut to 14 seconds after Zaferes clocked the fastest time of 57:51.
Image by: Royal Gazette