Nicknamed "Rosko", he was, however, a specialist of the slalom discipline, in which he won three World Cups in 1969, 1971 and 1972, and in which he won a gold medal at the 1970 World Championships in Val Gardena. He was also second in the overall classification of the 1969 World Cup and third in the giant slalom World Cup 1969.
He was known as "Rosko", but he had a particular talent for the slalom event, winning three World Cups in 1969, 1971, and 1972, and earning a gold medal at the 1970 World Championships in Val Gardena. He also finished second in the overall standings of the 1969 World Cup and third in the giant slalom World Cup.