After Wilder rallied to hurt Ortiz with a pair of right hands late in Round 9, he continued his assault the following round.
He said after the fight: "I'm ready right now. There are loads of different ways we can do the fight, but let's just get it made".
Ortiz started the fight, not with a bang, but with a calculated gameplan that saw him throw several jabs at Wilder, disrupting the champion's rhythm and preventing him from landing his signature power punches and right jab. Blow after blow, it seemed it was only a matter of time before Wilder would go down or get stopped.
England's Joshua (20-0, 20 KOs) knocked down Klitschko in the fifth round of their epic slugfest April 29 at a sold-out Wembley Stadium in London.
The 32-year-old Wilder (40-0, 39 KOs), of Tuscaloosa, Alabama, was roughly a 3-1 favorite over Ortiz (28-1, 24 KOs, 2 NC).
However, Ortiz clearly had not read the script for this fight - returning to his feet and asking serious questions of his opponent's character in the forthcoming rounds.
Despite the ease in which he's blown through opposition, Wilder is still criticized.
He said: 'It could happen here in NY, there is no question it would sell out here and that we'd set a record gate for the Barclays with that fight.
The tense clash then swung wildly once more in a mad 10th round which had Ortiz down and out with just 55 seconds left until the bell. Ortiz, perhaps tired from throwing so many punches in the seventh round, didn't do much in the eighth. It was a quiet round but a round which Ortiz had the upper hand. You know, you got promoters signing this man just to keep him away from fighters. Ortiz tried as hard as he could to finish Wilder, but Wilder was able to hold and move his way to the end of the seventh round. For the record, BB had the action scored 86-84 for Ortiz going into that 10th session. Though he never hit the canvas, he stumbled to his corner when that round ended.
Both fighters felt each other out for the first four rounds, to the chagrin of the fans in attendance. In December, after Ortiz demolished a no-name opponent in his comeback fight, Wilder climbed through the ropes to stage the kind of verbal confrontation that has always been a staple of professional wrestling. He'd spent the opening four rounds nearly exclusively conceding ground to a game opponent while failing to establish the jab or land any significant punches, a recipe that placed him at an early deficit on the scorecards and prompted audible jeers from the restless Brooklyn crowd. WBO world middleweight champ Billy Joe Saunders said: "He is a racist c**t I think, I personally think he is".
Wilder had been looking for that moment, and when it came, it was flawless, the punch landing on Ortiz and sending him to the floor. Neither man landed a clean punch. There was no need for a count, Ortiz was not moving. The Wilder-Ortiz fight was rescheduled. The two were set to square off November 4, 2017, at the same venue but Ortiz failed a drug test.
Stiverne, who was Wilder's mandatory challenger, replaced Ortiz. He had three opportunities to get that guy out of there.
Wilder said: "I want to unify".