Mai Murakami became the first Japanese woman to win the floor at the artistic gymnastics world championships on Sunday, while compatriot Kenzo Shirai captured his second title of the meet in the men's vault.Murakami became Japan's first female world champion in 63 years after winning the floor with 14.233 points. American Jade Carey took silver with 14.200, Briton Claudia Fragapane (13.933) bronze."Winning the gold medal is proof I'm improving," the 21-year-old Murakami said. "It might have been the best routine I've ever done."Keiko Tanaka in the balance beam was the last Japanese woman to…READ FULL ARTICLE