Beterbiev told DAZN: "If you compare my other fights, you can say [the first vs Bivol] was my toughest fight.
"I just think second time around they obviously know each other well, I just don’t know if the time keeps going on it favours Bivol a little bit more – he’s younger, he’s fresher.
CALLUM SMITH knows what it is like to face Artur Beterbiev and Dmitry Bivol in the ring - and is expecting fireworks on Saturday night.
Bivol and Beterbiev, 40, faced off in October, with the latter winning a controversial fight by majority decision.
“I seen a lot favoured Beterbiev, a lot favoured Bivol, a draw was probably a fair result.
