The world of athletics witnessed a highly unusual sight here tonight - that of Usain Bolt leaving the track as a non-winner.

Two years after his last defeat - also on this track - the world and Olympic champion had to give best to the man who has got closest to his world records, Tyson Gay.

After putting pressure on the lanky Jamaican with a characteristically swift start, the American was never headed in the 100 metres in DN Galan Samsung Diamond League here, and Bolt, grimacing with the effort, was not able to make his habitual 70m surge, finishing instead in 9.97sec, the second slowest time he has ever registered in a final.

Gay  won in 9.84.

It was a meeting record, earning him an automatic prize of a $10,000 (£6,200) diamond.

But it is the precious victory he will prize above all else.