Briton Dillian Whyte's heavyweight fight against Russian Alexander Povetkin has been moved to 4 July.
The Manchester Arena event, scheduled for 2 May, was also set to include Irish fighter Katie Taylor's world title bout against Amanda Serrano.
On Monday the British Boxing Board of Control suspended all events until the end of May because of coronavirus.
Whyte drove 40 hours to a training camp in Portugal last week in the hope that the fight would go ahead.
The heavyweight fight between Britain's Dereck Chisora and Ukrainian Oleksandr Usyk on 23 May at the O2 in London has also been postponed. No new date has yet been fixed.
Welshman Lee Selby's IBF lightweight title eliminator against George Kambosos Jr at the Motorpoint Arena Cardiff, which was originally slated to go ahead on 9 May 9, will now take place on 11 July.