He graduated Journalism and Economics at the Bucharest Academy of Economic and International Business Studies. His first contact with sports was at 17yo, at Dinamo Bucharest Football Club, where he played football but he soon found tennis more interesting and started to train with Florin Segărceanu. He practiced also swimming and mountaineering, he was a professional athlete and won several international crosses.
Ion Oncescu won his first national arm-wrestling title when he was 18 years old and since then has been undisputed champion. He became world champion for the first time (90kg) at the XXIXth World Arm-wrestling Championships in Veliko-Tarnovo, Bulgaria in October 2007. For the left arm competition, Oncescu fought in 10 matches, and 5 of his opponents were former world champions. He defeated 2-0 the great Russian champion Dzambolat Tsoriev in the final. The next day he had to compete for the right arm championship, was engaged in 8 matches and reached the final where he met the same Dzambolat Tsoriev, which he defeated 2-1.
Ion Oncescu won his third and fourth world titles at 100 kg, at the World Arm-wrestling Championships held in Kelowna, Canada in 2008. He had to fight in 20 matches, 10 for the left arm and 10 for the right arm and won the two world titles with ease. Oncescu won also 2 titles of European Champion in 2009 at Sofia, Bulgaria. On January 24, 2010, he defeated 300 arm-wrestlers, including professionals.
Profile of Ion Oncescu at World of Armwrestling.