Sergey Kovalev

Forget Beyonce or Justin Bieber ... there's only one huge star Sergey Kovalev wants by his side as he enters the ring to fight Andre Ward -- Russian President Vladimir Putin! The Russian boxing superstar is all set for a championship superfight with Ward on Nov. 19th on HBO PPV -- it's definitely…

Light heavyweight boxing champ Sergey Kovalev says he's driven to be a champion by the memory of Roman Simakov ... the man who died 3 days after fighting Sergey back in 2011. We talked to Kovalev about Conor McGregor revealing he's been seriously disturbed by the fact he trained MMA fighter…