Nobody thought I was going to win, nobody did.
Ruiz himself says he will take the contest at any time.
Joshua brings an undefeated record of 22 wins, including 21 knockouts, to the ring against Ruiz who has 32 wins and one defeat including 21 knockouts.
"All I need to do now is get in shape and look like "AJ", I want to get in really good shape.
His whole career was consisted of lies, contradictions and gifts", Wilder said of Joshua. Right then and there, Joshua was being asked to look ahead of Ruiz - not an ideal situation.
Ruiz had not been given much chance of beating the champion given he had just five full weeks to prepare after Joshua's scheduled opponent, Jarrell Miller, tested positive performance-enhancing drugs. "Without him this wouldn't have been possible", Ruiz said post-win.
Joshua floored Ruiz in the third round, but was ultimately well and truly beaten in an upset arguably to rival Mike Tyson's famous loss to Buster Douglas and Lennox Lewis' defeat to Hasim Rahman. Joshua was saved by the bell. "The speed got him", said Ruiz.
What started with nothing but smiles and promise from Joshua in NYC earlier in the week, ended in scathing disappointment late Saturday night with any thoughts of an undisputed title fight between he and Wilder seemingly gone in a NY minute.
Joshua got up after the third knockdown and fourth knockdowns in the seventh but he spat out his mouthguard and the referee waived it off while he leaned on the ropes.
It was a stunning defeat for Joshua, who was making his American debut only to be battered and lose for the first time in 23 fights. He was defending his slices of the heavyweight title - Wilder has the other one - and although he gave away more than 20 pounds to the 5-11 Ruiz, he enjoyed massive advantages in height, reach and athleticism.
Wilder, who confirmed a huge rematch with Tyson Fury the day before Joshua took on Ruiz, didn't hold back in his criticism of Joshua on Twitter.
"We did an upset, just exactly what I have been saying from all the people that doubted me, I just proved them wrong", Ruiz said.
Now the unified champion in the revivified heavyweight division, Andy Ruiz has dedicated this historic victory to his fellow underdogs, and all those with a little extra weight around the waist. "He is the champ for now but I shall return".
"If it wasn't for my dad, I wouldn't be here", Ruiz said.
On Tuesday, WBC heavyweight champion Deontay Wilder took to his social media accounts and announced a rematch with Luis Ortiz, with a date and venue to be named soon.
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