Japan's Ryuju Nagayama won his first world title on Friday in the men's -60kg at the world judo championships as Italy's Assunta Scutto won the women's -48kg title. After winning his first bout on penalties, Nagayama -- a bronze medallist at last year's Paris Olympics -- was then imperious for the rest of the day. In the final against promising Frenchman Romain Valadier-Picard, the 29-year-old Japanese judoka stepped up a notch in the second half of the bout to win by ippon. Ten years after his junior title, Nagayama finally reached the top step of a world championship podium after finishing third twice. In the women's category, Scutto defeated Azerbaijan's Abiba Abuzhakynova in the final. Last year's world silver medallist and a bronze medallist the previous two years, the 23-year-old judoka completes her collection with world gold.