Joseph Parker is the only man to defeat Andy Ruiz, who currently holds the WBO, IBF, IBO, WBA heavyweight titles.

Parker won a razor close twelve round decision over Ruiz for the vacant WBO world title in December 2017.

But then a few months later, Parker lost his title and a twelve round decision to Anthony Joshua. Parker is still the only boxer to go the full twelve rounds with Joshua.

But then earlier this month, Ruiz stopped Joshua in the seventh round to capture the four belts, in a massive upset at Madison Square Garden in New York City.

In the bout, Ruiz dropped Joshua four times before the contest was waved off.

Parker explained why he was able to beat Ruiz and Joshua was not.

"I think the movement that I presented in that fight caused him [Ruiz Jr] a lot of trouble, and caused him to miss a lot of shots. A lot of the shots, there wasn't really any big flush shots that landed. A lot of them were grazing shots and a lot of them were shots that I was able to maneuver and move back with them. Even though they were hitting me, it wasn't getting the same impact as it was on Joshua," Parker said to Sky Sports.

"AJ's style, when we see him fighting, he moves back, but a lot of the fights, he likes to come forward. I guess this is sort of a first experience of fighting someone who just continuously puts pressure on.

"AJ threw nice shots and connected with Andy, but Andy is a fighter who takes two to three punches to throw three, four, five, six back. I guess I'm able to move, because I'm a little bit smaller. With AJ's size, it might have been a bit hard for him to move around and jump around with all that muscle that he has."