Only Ricky Hatton has picked up more in one night as he earned in excess of £15m for his clash with Floyd Mayweather jnr in 2007 in Las Vegas.
The heavyweight clash at Wembley Stadium is generating huge interest, with sources close to the fight predicting it will reach 1.5m sales on pay-per-view, eclipsing the previous record of 1.15m for Mayweather’s clash with Manny Pacquiao in 2015, which was 100,000 above the American’s fight with Hatton.
That would bring in almost £30m before tax, which alone would smash the total for Britain’s richest fight, Carl Froch’s rematch with George Groves at Wembley, which brought in about £22m.
Joshua’s defence of the IBF belt against Klitschko will also generate gate receipts worth about £7m.
US television rights sold for almost £2.4m, with Showtime and HBO sharing the rights.
It is only the third time the US broadcasting behemoths have agreed to share a boxing event, with Mayweather v Pacquiao and Lennox Lewis against Mike Tyson the previous two.
German TV RTL has also paid about £4m to broadcast the event in the country where Ukrainian Klitschko is a star.
More than £1m is being pumped in by sponsors, while merchandising could also break the £1m barrier to deliver an eye-watering total well in excess of £40m.
The costs of running the event will be subtracted as well as taxes and those involved, like Sky, will take a cut. But it is believed Joshua and Klitschko could be left with a £30m pot to split.
Klitschko is aiming to join an exclusive club alongside ring icons Muhammad Ali and George Foreman, who have regained the world heavyweight title when all the odds were stacked against them.
Ali travelled to Zaire in 1974 to face Foreman, who was at his monstrous best, and outwitted him with the fabled ‘rope-a-dope’ tactics. And Foreman, at 45, became the oldest heavyweight champion when he knocked out Michael Moorer to claim the WBA and IBF belts.
Johnathon Banks, Klitschko’s trainer, believes that at 41 his man…