When he won gold for decathlon at the 1998 Budapest European Championships, he became a sports hero. Two years later, when he won the gold medal for decathlon in the 2000 Summer Olympics in Sydney, he became a national hero. Although Nool did not place first in any individual event, his total score was the highest. Nool won the title after the competition referee decided to over-rule a discus judge, who had red-flagged his last and only valid attempt due to alleged step-out. The reinstatement of his 43.66-metre third throw sparked unsuccessful counter-protests from other teams. Nool took gold ahead of the Czech Roman Šebrle and American Chris Huffins.