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 called "Rosko", but he excelled in the slalom discipline, winning three World Cups in 1969, 1971, and 1972, and taking a gold medal at the 1970 World Championships in Val Gardena. He also placed second in the overall standings of the 1969 World Cup and third in the giant slalom World Cup.