Felix Sanchez of the Dominican Republic won the men\'s 400m hurdles Olympic title on Monday in a time of 47.63sec, taking a title he first won at the 2004 Athens Games. The 34-year-old beat home American Michael Tinsley, who ran a personal best of 47.91sec, while the pre-race favourite Javier Culson of Puerto Rico took bronze in 48.10sec. Great Britain\'s world champion Dai Greene finished fourth.