Going past the seventh round for the first time in his career Joshua responded to hitting the canvas for the first time by securing an incredible win against an opponent who surprised everyone.
Joshua had to fight more than in any of his other bouts by some distance, as Klitschko showed far more than in his bout with Tyson Fury.
Klitschko was superb and belied his 41 years as he showed great poise and mobility as Joshua struggled to keep the pace with the former world champion.
However in the 11th, out of nowhere, Joshua found something, something deep down inside him and he unleashed an incredible right-hander to floor Klitschko.
He got up, but he was met by a left-hook and the referee ended it there and then, to give Joshua his 19th win, all by stoppage.
Read the full article on eurosport.co.uk: Joshua stops Klitschko in 11th round of epic bout