Onni Pellinen began at the capital club Helsingin Visa, who belonged to the Finnish Sports Federation TUL workers, with the rings. In 1923, he wrestled for the also part of the TUL club Turun Weikot. In 1924 he moved to the Turun Voimamiehet, a club that belonged to the devices connected to the Wrestling World Association Association. The following year he came to Helsingin Kisa - Veikot. Pellinen soon became one the world's best light heavyweight and won three consecutive Olympic Games medals. However, winning a gold medal eluded him. He provided in his career, many exciting battles against the Swedish world-class wrestler Carl Wester Green and Rudolf Svensson. In 1928, he was close to the Olympic victory, but lost the final complete surprise against in the former international wrestler scene completely unknown Egyptians Ibrahim Mustapha and had to be content with the silver medal. In 1935, he started for the Helsingin Paini - Miehet one last time at the Finnish Championships and finished at the European Championships in Copenhagen a sixth place. Nioch in the same year he went as a coach in Turkey and led the Turkish wrestler quickly becoming a world leader. Pellinen died in 1945 46 -year-old in Turkey.
(OS = Olympic Games, European Championship EM =, GR = Greco-Roman style, F = Freestyle, Mi = middleweight, Hs = light heavyweight, then to 79 kg or 87 kg body weight)
Onni Pellinen 1923 light heavyweight and 1922 in the middleweight champion of the workers' Sports Federation TUL and 1926, 1927, 1929, 1931, 1932 and 1935 Finnish champion in the light heavyweight division, each Greco-Roman style and 1933 champion in freestyle, light heavyweight.