The rivals went face to face for the first time since Joshua was surprisingly beaten by Ruiz Jr in the country that will host their rematch.
“The hunger still remains,” Ruiz Jr said ahead of defending the IBF, WBA and WBO titles that he took from Joshua.
“I don’t want 15 minutes of fame. I want it to last. I want a generation. I want to be a champion for more years.
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“Two big heavyweights punching each other in the face, it’s going to be exciting.
I’m going to win here in the same fashion that I won on June 1.”
Joshua was floored four times and beaten in seven torrid rounds by Ruiz Jr on his US debut in New York.
The surprise result ended Joshua’s unbeaten record, his world heavyweight title reign and his hope to fight Deontay Wilder to crown an undisputed champion.