Wilder told them to get the ambulance ready for his opponent on Saturday night (Sunday AEDT) and the heavyweight champion made good on his promise with a stunning TKO victory at the Barclays Center in Brooklyn.
"King's don't chase peasants".
Facing the camera and addressing Joshua directly, he said: "I declare war on you!"
But Wilder watched the Brixton brawler stink out The Principality stadium with a tedious points win over Viking stiff Robert Helenius and is not interested in lowering his standards.
Wilder knocked Stiverne out in Round 1 for his sixth successful title defense.
Do YOU want to write for GiveMeSport? "I've just lost the fight with (Kubrat) Pulev". "If you go to Vegas if they want this fight, they can put up more money then anywhere". I know I'm the champion. "A king takes kings", Wilder said.
Whether the Matchroom boss has a change of heart following Wilder's explosive win remains to be seen but there are many in the sport who would rather see Joshua share the ring with Wilder than with United Kingdom rival Tyson Fury - as proposed now.
"No heavyweight can compare to me, I move like a middleweight. the things I can do in the ring and what I see is insane, I' m very confident in what I do".
Ortiz could be almost 40 by the time he contests titles again while England's Tyson Fury is five or six stones overweight and a long way from title contention, despite all his regular promises on social media of winning back the titles in 2018.
"No more diving, no more ducking, no more dodging".
Deontay Wilder said during the build up to his second fight with Bermane Stiverne that things weren't going to be the same as the first fight. "I want Joshua. If he doesn't give me the fight we have other plans", added Wilder.
WILD AMBITION Deontay Wilder is fighting this weekend - but could he REALLY beat AJ? "Make a date, don't wait". I'm saying it because two unbeaten heavyweights, one unified champion, one lineal champion, both over six foot six tall, both over 18 stone.