Japanese Olympians Ruka Hirano and Mitsuki Ono each racked up a second straight snowboarding World Cup halfpipe victory Saturday in the third round of the tour at California's Mammoth Mountain.The 20-year-old Hirano took out the men's competition, while the 18-year-old Ono finished on top of the women's field, continuing their success from the previous round in Laax, Switzerland.Hirano scored 91.50 to finish 6.25 points clear of Australia's Valentino Guseli and register his fourth career World Cup win.Chase Blackwell of the United States rounded out the podium, while Japan's Yuto Totsuka, K…READ FULL ARTICLE