By David Martin, PA International

Allen Johnson brilliantly clinched his fourth World Championship 110 metres hurdles title in Paris.

Defending the gold medal he won in Edmonton two years ago, the American cruised over the 10 hurdles, winning in a time of 13.12 seconds.

The former Olympic champion and fastest man in the world this year, who had only been beaten once this summer, finished well clear of runner-up Terrence Trammell.

Trammell, Johnson's Team USA colleague and a former world indoor 60m champion, clocked a season's best of 13.20secs. Third place went to China's Liu Xiang, the 20-year-old world junior record holder finishing in 13.23secs.