At the age of 12, László Hidvégi bet a friend a bar of chocolate that he could jump off the platform tower. After a successful bet, Hidvégi stayed in diving. From 1930 he was a competitor for MAC and from 1945 he was with FTC. Between 1936 and 1950, he won the Hungarian championship 11 times on springboard and 12 times on platform. Between 1934 and 1950 he earned 18 international caps. In 1936, Hidvégi competed at the Berlin Olympics and finished 18th in both events, which was the first time that Hungarian divers took part in the Olympics. In 1937 and 1947, he won the World University Championship in springboard. At the European Championships he finished third on platform in 1938 and on springboard in 1947. Hidvégi was also nominated for the 1948 Olympics, but did not start. He then became the head coach of the Hungarian divers, and in 1956 emigrated to the United States.