Kovalev not worried about Cleverly's crowd

So what to we know about Sergey Kovalev, the formidable Russian destroyer who challenges Welshman Nathan Cleverly for the WBO World Light-Heavyweight strap at Cardiff's Motorpoint Arena this Saturday? Known as 'Krusher', the 30 year old was born in the city of Chelyabinsk, an ice hockey stronghold, in April 1983. He began boxing aged 11