Defending champion and three-time winner Lydia Ko has made a strong start to the Canadian Open in Calgary.

The world number one is four-under through the first 10 holes to sit one shot behind leader Mirim Lee of Korea.

Ko, coming fresh off a silver medal performance at the Rio Games, began the tournament with a birdie at the opening hole, the 10th hole. She followed that up with further birdies at the 12th, 15th and 18th to be four-under at the turn.

She currently sits in a share of second with Koreans Mi Jung Hur, So Yeon Ryu and Stephanie Meadow of Northern Ireland.

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Ko won the 2012 Canadian Open aged just 15 to become the youngest ever winner of an LPGA Tour event. She then defended her title as an amateur a year later.

Meanwhile Danny Lee has shot a three-over 74 in the opening round of the Barclays tournament on the Bethpage black course in New Jersey.

Lee sits in a share of 94th.