[1] Tigran Martirosyan began weight training in 1995 under the guidance of Vahan Bichakhchyan.

Martirosyan competed at the 2004 Summer Olympics in Athens and came in seventh place with a total of 367.5 kg.

[2] Martirosyan won a bronze medal at the 2006 World Weightlifting Championships in Santo Domingo, finishing behind Andrei Rybakou and Aslambek Ediev.

The following year, Martirosyan won a gold medal at the 2008 European Weightlifting Championships in Lignano.

[6] Martirosyan won a silver medal in the snatch at the 2009 World Weightlifting Championships in Goyang, but had to withdraw from the competition afterward due to a back pain.