Career
Boyadzhiev made his official debut for the 2004 Summer Olympics in Athens, where he placed second in the preliminary pool of the men"s 120 kg class, against Iran"s Alireza Rezaei, Mongolia"s Gelegjamtsyn Ösökhbayar, and Belarus" Barys Hrynkevich. At the 2008 Summer Olympics in Beijing, Boyadzhiev competed for the second time in the men"s 120 kg class. He lost the qualifying round to Russia"s Bakhtiyar Akhmedov, who was able to score two points each in two straight periods, leaving Boyadzhiev without a single point.
Because his opponent advanced further into the final match, Boyadzhiev offered another shot for the bronze medal by entering the repechage bouts.
Unfortunately, he was defeated in the first round by Iran"s Fardin Masoumi, with a technical score of 3–6.