Ruiz, who was born in America but fights for Mexico, caused a major shock in June when he handed out a first defeat for Joshua to win the WBA, IBF, WBO and IBO world titles in New York.
In the third part of the trilogy of press conferences to promote the rematch in Saudi Arabia, Joshua said: “My fights are the elite of the elite and are top of the crop. That little bit of motivation of fighting someone who has the skill set and is the champion.
“It’s not like I’m fighting someone as a stepping stone to a champion. We can’t overlook Andy and his talent and his success in the ring as I’m fighting the best out there right now. In my opinion Andy Ruiz is the best heavyweight out there.
“I respect Andy and his team. I’m happy for him. I know what it means to fight for the championship and win the championship so he’s given hope to the people of Mexico.”
Former Olympic champion Joshua was knocked down four times by Ruiz before he was stopped in the seventh round on his US debut this summer, marking one of the biggest upsets in heavyweight history. But he says his motivation to return to the top is a big factor ahead of the December rematch.
He added: “Once I’ve got my purpose of life organised, I can do anything and that motivation will be the same. Put me on the street to clean graffiti off the wall, I want to make sure my graffiti cleaning is better than yours – and that’s just my purpose in life.
“So motivation isn’t just about boxing. I’ve got to make a few changes in my lifestyle now to correct and align them again so I align my stars.”
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