Former super-middleweight champion Nigel Benn has insisted that this weekend's fight between Floyd Mayweather Jr and Manny Pacquiao is simply too close to call.

Two of boxing's biggest names finally come face to face at the MGM Grand in Las Vegas in the early hours of Sunday morning, in what is expected to be the highest grossing bout of all time.

Despite claiming that the contest "could go either way", Benn believes that Filipino star Pacquiao will come out second best unless he goes all-out in the early rounds.

"I still follow boxing and I am really looking forward to this fight. Without a doubt, it's the big one for the sport," he told the Express & Star. "It's hard to put your money on anyone, but it's going to be a great occasion and one not to be missed. It really could go either way.

"It's either going to be Pacquiao early or Mayweather late. I don't think the time that has elapsed since we were first talking about the fight will change that. They both knew what they have to do, regardless of whether it's five years too late.

"This is the night of their lives and they will be up for it. It's not about age, it's about mentality. They are both more dedicated than they have ever been."

Undefeated Mayweather Jr has insisted that he will win the highly-anticipated clash.