1980 at the Olympic Games in Moscow in 1980 was Niklaus twelfth with 7762 points ( = 7721 points according to the currently valid 1985 rating ). At the World Championships 1983 in Helsinki Niklaus finished with 8212 points ( = 8207 points) in fifth place.
In the Swiss Athletics Championships, he won the 1983 title in the 100 -meter run, 1981, 1982 and 1983, he was champion in the decathlon. From 1981 to 1983, he improved to five times the Swiss decathlon record, he was the first Swiss decathlete who could surpass the 8,000 - point mark. On 2 and 3 July 1983, he turned in Lausanne with 8337 points, his personal best, which were changed after the scoring of 1985 to 8334 points and mean reigning Swiss record.
At a height of 1.89 m his competition weight was 90 kg.