Uncertainty surrounded the composition of Sunday's men's medley relay final, after Jamaica lodged an appeal following their team's disqualification from today's semi-final because of a faulty first changeover.
Anchored by Usain Bolt on the final, 400-metre leg, the Jamaicans had looked strong candidates for gold.
In their absence, Poland, who nipped in ahead of the United States to win heat one - 1:54.45 to 1:54.75, with Japan close in third with 1:54.93 - may have a shout at the gold, although a number of squads are expected to make several changes to their team's composition for the final.
