On a night where bitterly cold and squally conditions affected some events in the Swedish capital, Barr clocked a reasonable 50.28 seconds in a 400m hurdles showpiece won by European and world champion Karsten Warholm of Norway.

USAIN BOLT has brought his 2010 season to an early close to avoid risking a serious injury which could hamper the defence of his world titles in Daegu next year.

Usain Bolt will not race again this year due to a lower back injury, his management company have announced.