Andy Ruiz Sr., the father of heavyweight contender Andy Ruiz, expects unified champion Anthony Joshua to get completely confused once the fight plays out on Saturday night.

Ruiz will challenge Joshua for the WBA, WBO, IBF, IBO world titles on June 1 at Madison Square Garden in New York City.

Miller was physically bigger and has a more active punch output, but Ruiz has a deeper resume, has faster hands and throws far more combinations. Both have a good chin and the power is very similar.

The elder Ruiz expects his son's hand speed and combinations to create a lot of issues that Joshua won't easily be able to figure out.

"I knew that he had a lot of potential because when he was 12 years old he was beating people that were 30 years old, 25 years old," Andy Ruiz Sr told Sky Sports.

"Police officers where we lived they used to say 'may we spar with you son' and they wanted to spar with Andy but they didn't know what to do.

"So I think that is what is going to happen with Anthony Joshua, when he starts getting in the ring, he's not going to know what to do. The speed that he has and you saw those shots to the liver.

"It's going to be a real good fight. I've got a lot of respect for Anthony Joshua, he's a real nice person but in the ring we will see who is best."