The 100m gold medal winner Usain Bolt has been tipped for victory in tonight's 200m final by former 400m hurdles champion Ed Moses.

The race has been billed as a battle between Bolt and Jamaican compatriot Yohan Blake and Moses believes that Bolt's stride will give him the edge.

"It comes down to the biomechanics of his running stride, which is longer because of his height," Moses told The Telegraph.

"If he gets up to speed, there is no stopping him because he can take advantage of the incredible leverage his legs give him."

Blake beat Bolt in both the 100m and 200m in the Jamaican qualifiers, but Bolt took the 100m title on Sunday.