WBO, IBO, IBF, WBA heavyweight champion Anthony Joshua is not taking any chances with his upcoming bout against Andy Ruiz.
Ruiz is a late replacement for Jarrell Miller, who was pulled from the fight after coming up positive for performance enhancing drugs in three separate tests.
Their contest takes place n June 1, at Madison Square Garden in New York City.
Joshua, who makes his American debut in the contest, has been studying a lot of footage with Ruiz's bouts.
He is very impressed with Ruiz's hand speed and his combinations.
"If you watch some of his fights a lot of his knockouts have come from combination punches. And I feel like it's the punch you don't see that hurts. And Ruiz Jr has got speed in both hands," Joshua said to Sky Sports.
"So I have got to make sure I work on my reactions - staying off my phone to make sure that my eyes aren't too tired because I've got to stay sharp with my eyes and how I react to these type of punches."
The only defeat on Ruiz's career is a twelve round decision loss to Joseph Parker in December of 2016. The contest was very close and there were some who felt Ruiz had done enough to pull out the win.
"His strengths are his ability to come forward and absorb punishment and avoid punishment, as well. Because a come-forward fighter seems to walk into punishment - he doesn't take too much stick. He can knock guys out so that means he's heavy handed. He has the ability to throw combination punches whereas I feel like the European style that I have been taught is 'jab, one, two, jab, one, two, hook'. But he can throw left hook, right hook, left hook, right hook, uppercut, hook, right hook to the body," Joshua said.