Team GB's Dai Greene has finished fourth in the 400m hurdles semi-final at the Olympics.
Greene looked assured in the early stages of the race but he failed to find his rhythm in the final 200m.
However, results in the other semi-finals mean the Brit will contest in the final
Veteran Felix Sanches produced a surprising performance to win the race in a time of 47.76s and he will be joined by Jehue Gordon in the climax of the event.
