New Zealand golfer Lydia Ko has got her title defence at the Canadian Open off to a flying start.
The world No.1 is one shot off the lead after posting an opening round of five under par.
The 19-year-old mixed two birdies with a bogey on the front nine before turning in four under on the homeward stretch for a 67.
England's Stephanie Meadow leads the tournament at six under, while Ko shares second place with two South Korean golfers, Mirim Lee and Mi Jung Hur.
Ko has won the Canadian Open three times, twice as an amateur.