FILE PHOTO: Athletics - Diamond League - Monaco - Stade Louis II, Monaco - July 9, 2021 Norway's Karsten Warholm celebrates winning the men's 400m hurdles REUTERS/Gonzalo Fuentes/File Photo
(Reuters) - With World Championship titles and the 400-metre hurdles world record in his possession, there is only one jewel left for Karsten Warholm to add to his athletics crown: Olympic gold.
Yet it could be the hardest test the 25-year-old Norwegian has faced so far.
