Karsten Warholm broke the men's 300m hurdles world record on Saturday at the opening Diamond League meeting of the season in Xiamen, but Olympic 110m hurdles champion Grant Holloway suffered a shock defeat. The 29-year-old Norwegian 400m hurdles world record holder crossed the finish line in a blistering 33.05 seconds, taking 0.21 seconds off his own mark set four years ago in the little-run event. "I thought it was a very good race and a little bit surprised over how easy my legs were feeling out the last bend," said Warholm, who won gold in the 400m hurdles at the 2020 Tokyo Olympics and silver in Paris last year.