Anthony Joshua believes he is only going to improve after beating Wladimir Klitschko in an epic heavyweight fight on Saturday night.
Joshua beat the 41-year-old Ukrainian via a technical knockout in the 11th round to retain his IBF title and also claim the WBA 'super' belt in front of 90 000 fans at Wembley.
— FOX Sports Asia (@FOXSportsAsia) April 30, 2017
The 27-year-old Joshua, who recorded a perfect 19th professional win, said he had to show character to beat his more experienced opponent but warned his rivals that he will only get better.
Joshua said: "This is boxing – I'm only going to improve. Sometimes you can be a phenomenal boxer but this sport is about character. When you go to the trenches, that's when you find out who you really are.
"In this small little ring there's nowhere to hide. As I said from the get-go, it will be a boxing classic and the best man will win. There's no complications with boxing – anyone can do this.
"I came out and I won – that's how far I had to dig. I didn't go into a 12-round slug-fest and struggle to beat Klitschko. I came back and fought my heart out."
The Englishman also had nothing but respect for Klitschko, who he said is a role model for the sport.
Joshua continued: "As boxing states, you leave your ego at the door and respect your opponent, so a massive shout-out to Wladimir Klitschko for taking part.
"I'm not going to say too much in case he wants to come back and fight me again, but in terms of the boxing Hall of Fame and the boxing arena, he's a role model in and out of the ring.
"I've got nothing but love and respect for anyone who steps inside the ring."