Bolt beats Gatlin to retain his World Championship crown

Usain Bolt has beaten Justin Gatlin to take gold in the men's 100m final in Beijing.

The American, twice suspended from athletics for failed drugs tests, backed up his form in the early round by taking victory in a time of x.xxs.

Bolt, who stumbled in his semi-final before taking first in the semis, had looked short of his best throughout the rounds.

However, the Jamaican recovered from slow start to overtake Gatlin in the final strides and clock 9.79s.

Gatlin, who has earned a reputation in some circles as a villain of athletics after serving two previous doping bans, had run faster in the semi-finals and was unbeaten in 28 races heading into the Beijing final.