Xinhua Beijing February 13 (reporter li) Rio DE janeiro Olympic Games men's judo bronze medalist Cheng Xunzhao in France local time 12 judo grand slam back to break through in the competition, won the men's 90 kg title, this is China's men's judo athletes won the first gold medal in world grand slam. Cheng Xunzhao had made history in the Rio last year Olympic Games, won a bronze medal, for the Chinese Olympic medal zero breakthrough in men's judo. In Rio...