Two-time reigning Olympic men's champion Kohei Uchimura failed to qualify for the final of the six-apparatus event on Friday, the opening day of Japan's gymnastics national championships.Uchimura, also a six-time world all-around champ, placed 37th and did not advance to Sunday's final, which will be contested by the top-30 gymnasts.The three-day national championships at Takasaki Arena in Gunma Prefecture serve as qualifiers for October's world championships in Stuttgart, Germany.The 30-year-old Uchimura, who revealed Thursday he has pain in both shoulders, was error prone, falling in both…READ FULL ARTICLE