Boxing promoter Eddie Hearn believes Anthony Joshua can rule the boxing world if he can beat Wladimir Klitschko on Saturday.
The 27-year-old Joshua will be the home favourite as he takes on veteran Klitschko in their blockbuster heavyweight bout at a sold out Wembley Stadium in London.
If Joshua defeats the 41-year-old Ukrainian, Hearn feels the British fighter will be the most marketable figure in the sport.
Hearn told Sky Sports: "He becomes the biggest star in British sport and the biggest star in world boxing. It's early in his career, it's his 19th fight, so masses of pressure.
"We talk about this 10-year plan, we're kind of having a legacy fight within the first couple of years. It's here, the timing is perfect.
"He could sell out any arena, against anyone, but he wants to be remembered for the big fights.
"This opportunity won't be there forever. You fight Klitschko now, or it never happens. He wants to be in those big fights, he wants to take on the very best."