"We've been underdogs all through this tournament. We have nothing to lose and everything to win. We'll leave everything out there."
-- Boris Vulchanov, interviewed before the Bulgaria v Japan semi-final 2014 (QWC)
He and the other Bulgarian Beater at the 2014 tournament, Dimitar Draganov, are considered to be a “competent” duo (QWC).
Bulgaria were the winners of the 2014 Quidditch World Cup tournament, finally beating Brazil in a thrilling match by 170 points to 60. Beaters Vulchanov and Draganov were able to prevent Brazil’s Chasers from running up the score by their strong defensive tactics during the game (QWC).
Other canon notes and references
Since Bulgaria's Seeker, Viktor Krum (born 1976), was the oldest player at the tournament (QWC), Vulchanov must have been born after 1976.
Boris is a Slavonic name, the short form of Borislav and derives from boru (meaning "fight, battle") (Baby Namespedia).
Lexicon timeline of Quidditch
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From the Web
Writing by J K Rowling on WizardingWorld.com (Pottermore):
Writing by J K Rowling (The Daily Prophet's coverage of the 2014 Quidditch World Cup, originally from Pottermore, and saved on Imgur):
- History of the Quidditch World Cup
- Quidditch World Cup 1990-2014
- Match reports and articles from the 2014 Quidditch World Cup
Harry Potter Wiki: Boris Vulchanov