Japan's Kenzo Shirai on Saturday won the men's floor exercise gold medal for the third time at the artistic gymnastics world championships.Shirai, the all-around bronze medal winner, produced a "Shirai 3," a double-backward somersault triple-twisting layout named after him, en route to successfully defending his title with 15.633 points.The 21-year-old, who topped the qualifying round, finished 1.100 ahead of Israel's Artem Dolgopyat, who scored 14.533 for the silver medal. American Yul Moldauer took the bronze with 14.500."I am relieved, said Shirai, the first Japanese to win the men's wor…READ FULL ARTICLE