The heavyweight showdown between Great British boxer Anthony Joshua and Ukraine's Wladimir Klitschko is set to become the biggest fight in British history with ticket sales hitting the 80,000 mark.

Last month, the first 50,000 tickets for the Wembley bout were sold within hours and the latest release of another 30,000 tickets have also been snapped up quickly.

Joshua is the IBF heavyweight world champion while Klitschko is the former WBA, WBO and IBO champion.

Promoter Eddie Hearn now has his sights on a crowd of 90,000. The Mirror reports that Hearn has permission to sell 80,000 tickets and request to increase the capacity by another 10,000 if approved by London mayor Sadiq Khan.

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Ticket sales alone could make 8 million pounds (NZ$14.3m) with the broadcast rights another reported 42 million pounds (NZ$74.8m).