Heavyweight contender Andy Ruiz is studying tapes of former undisputed champion Mike Tyson, to replicate certain tactics to use against unified champion Anthony Joshua.
Ruiz will challenge Joshua for the IBF, IBO, WBA, WBO heavyweight titles on June 1 at Madison Square Garden in New York City.
Joshua, who makes his debut in the United States, is a heavy favorite to win the fight.
Ruiz replaces Jarrell Miller, who was pulled from the contest after testing positive for performance enhancing drugs in three tests.
Ruiz is under no illusion about the odds.
"All the people are underestimating me, but it’ll be a hell of a fight. They’re going to see what I’ve got. I’m here to shock everybody, shock the world and show them what I’m all about," Ruiz told Gareth Davies of The Telegraph.
"I’m ready for Anthony Joshua. Hopefully he’s overlooking me, thinking I’ll be a piece of cake. It’s a whole different ballgame when they’re in the ring with me. Once they see the speed and accuracy I have, I know I will shock him a lot.”
Ruiz has noticed a lot of flaws in Joshua and plans to exploit them in the contest - with Tyson-type tactics.
The once-beaten boxer wants to get inside and work Joshua over on the inside.
“I’ve seen a lot of weaknesses in him and I’ve seen him working on them. The main thing is to stick to the game plan. I don’t want to say too much about his weaknesses. I’ve just got to improvise and exploit them when the bell rings,” explained Ruiz.
“We’ve seen a lot of videos of Mike Tyson. We’re working on some of the moves he did so I can get to Anthony Joshua. The main thing is we’ve got to stay focused and prepared. Get ready for anything and stay in shape.”