LOS ANGELES (AFP) - Thailand's Ariya Jutanugarn closed with a 12-foot birdie putt to win the Canadian Women's Open by four strokes on Sunday and post her fifth victory of this calendar year.

The 20-year-old Ariya entered the final round with a two-shot lead and never wavered as she stormed to victory on the Priddis Greens course in Calgary, Alberta.

The Bangkok native also kept her perfect 54-hole record intact as she has won each time she has led this year heading into the fourth round.

She finished in style, making birdies on holes 12, 14, 15 and 18.

"I felt like I wanted to have fun and be happy on the course. No matter what's going to happen, I can handle it," said Ariya. "I feel really happy with myself right now."

The world No. 2 women's golfer closed with a six-under-par 66 to finish at 23-under 265 and beat South Korea's Kim Sei Young by four strokes.

Ariya posted three consecutive wins in May. She added a fourth win at the Women's British Open before going to the Olympics, where she pulled out due to a left knee injury.

Another South Korean, Chun In Gee, the winner of the 2015 US Women's Open, took third place at 270 after a 69. Crowd favourite Alena Sharp, of Canada, wound up a career-best fourth after a 67 left her at 272.

Rounding out the top five were Karrie Webb of Australia and Anna Nordqvist of Sweden at 273. Webb closed with a 64 and Nordqvist with a 68.

The top-ranked Lydia Ko, who has won the event three times, was tied for seventh at 275.