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|Clean & Jerk||1993 Sofia|
|Clean & Jerk||1994 Istanbul|
|1994 Istanbul||-83 kg|
|Clean & Jerk||2003 Vancouver|
|2003 Vancouver||-85 kg|
|Clean & Jerk||2001 Brisbane|
|2001 Brisbane||-85 kg|
|Clean & Jerk2005||-85 kg|
Sergo Chakhoyan was born in Leninakan, Armenian SSR] (now Gyumri, Armenia) where many famous weightlifters come from.  He was national champion of Armenia multiple times, and is also a record holder. He won the silver medal in the 1994 World Weightlifting Championships, and also set a world record in the snatch, and in the clean and jerk with 175.5 kg. He became the second Armenian weightlifter after Israel Militosyan to set a world record. Chakhoyan participated in the 1995 World Championships and won the bronze medal in the snatch. He also participated in Atlanta Summer Olympics 1996, where he won a silver medal in the snatch. He took the sixth place in the bout.
Starting in 1997, he started performing under the Australian flag. He is a four-time Australian champion and is also a record holder in Australia and Oceania. In 1999 he took part in the World Championship and took the 10th place at the event. Chakhoyan re-occupied the sixth place in the Sydney 2000 Summer Olympics. He broke the Australian record in the snatch, with 175 kg and is and was awarded the a bronze medal. He won 3 gold medals at the 2001 Goodwill Games in Brisbane, and gained two world and one Australian record at the Goodwill Games. His world record for snatch was 181.5 kg, push for Australian record, 210 kg and world record for double world record, 391.5 kg. In 2003 he participated in the Russian championship in the snatch, setting a world record of 182.5 kilograms, and the world record at 392.5 kg for the double. He won the bronze medal at the 2003 World Weightlifting Championships. He won the gold medal in the snatch.
Chakhonyan pulled 175.0 kg of muscle while lifting his first attempt at the 2004 Summer Olympics. The second approach raises 175 kg and occupies the 4th place. He tried to lift 207.5 kilograms in the snatch, by which he would win the Olympic Gold Medal. Nevertheless, he was unable to raise the stroke and get out of the fight 0:
In 2005 he became Australian and Oceania champion. During the training, he was ill and used aspirin, for which he was not allowed to participate in the 2005 World Cup in Qatar. In 2007 he was caught doping, using benzyl-pepelz, and he was disqualified.