Late replacement Ruiz shocked the world when he flattened Joshua four times in a seventh-round TKO victory that saw him capture the WBA, WBO, IBF and IBO titles.
'If they're going to be investing this kind of money in the sport, we've got to be realists and say this is what's going to happen. The pressure isn't on me because I followed my dream, made my dreams come true.
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"I think what won him the Olympics was boxing, and I think what won him the world titles against Wladimir Klitschko and everyone else was boxing and being smart, '' he explained according to the report on Sky Sports".
He said it will be a clash of styles when he faces Joshua again and believes the former Olympic champion will struggle to fathom an effective strategy.
Joshua said he was "comfortable" and "very relaxed" ahead of the rematch.
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Despite his emphatic loss last time round, Joshua is the narrow bookmakers' favourite and spoke with confidence at the public workout that he could right the wrongs of that fateful night in the Big Apple.
"More boxing focused. More boxing focused, muscle memory and stuff like that..."
"I don't know what's in his mind, what's going on in the camp. Everybody has been treating me with love and especially enjoying the really good food that they have in this country", he said.
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The fight is part of the month-long Diriyah Season, which features a variety of major sporting events, including Formula E races, held a few days ago, the Diriyah Tennis Cup, in which eight of the world's best male tennis players participated, and the Diriyah Equestrian Festival, in which an elite group of riders compete to qualify for the Tokyo 2020 Olympic Games.