Freestyle World Championships: Ryan Stassel wins gold

American Ryan Stassel wins gold in the men's snowboard slopestyle final at the Freestyle World Championships in Kreishberg, Austria.

Stassel scored a 97.50 from the judges on his third and final run in what was described as a "perfect" ride.

Japanese 16-year-old Miyabi Onitsuka claimed gold in the women's event with a score of 92.50.

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