Japan dominated the big air podiums at the snowboarding world championships with five medals on Friday as Kokomo Murase headed a women's sweep and Ryoma Kimata triumphed in the men's event.Murase and Kimata claimed their maiden world championships golds in St. Moritz, Switzerland, with Japan enjoying its first podium sweep at either the snowboarding or skiing worlds since 1999 when it took all the medals in the men's ski jumping, won by Kazuyoshi Funaki.The 20-year-old Murase became the first Japanese woman to win big air gold at a world championships after she scored 85.75 and 76.75 from h…READ FULL ARTICLE