Thomas Barr has breezed through to the semi-finals of the men’s 400m hurdles at the World Athletics Championships in Doha, as new European holder Karsten Warholm staked his claim to successfully defend his world title in Qatar.

Ireland’s Thomas Barr has produced his best performance of the season in finishing second at the Bislett Games – as world champion Karsten Warholm sensationally smashed the long-standing European 400m hurdles record.