Yan Vazquez, representing Puerto Rico, ran the fastest time in the first round of the men's 400-meter hurdles, clocking a personal-best 50.66 at the World Athletics U20 Championships in Cali, Colombia. \n<\/div><\/div><\/td><\/tr><\/table>\r\n\t\t\t\t<\/div>\r\n\r\n\r\n\r\n\r\n