Mikaela Mayer has tested positive for coronavirus and will not fight in her scheduled bout on Tuesday in Las Vegas.
Mayer said: “It came as a complete surprise. I am currently asymptomatic and am quarantining at an off-site location per recommended guidelines.”
Her fight against Helen Joseph was planned for the first event since lockdown began by Bob Arum’s promotional company Top Rank.
The event, behind-closed-doors at Vegas’ MGM Grand Conference Center Grand Ballroom, will be headlined by WBO featherweight champion Shakur Stevenson’s debut in the division above against Felix Caraballo.
Mayer, the 2016 Olympian, is 12-0 as a pro.