Thailand's WBC world-ranked junior welterweight contender Sirimongkol Singwangcha has been ruled out of his proposed fight with former IBO world lightweight champion Isaac Hlatswayo at Emperors Palace on May 12.
Golden Gloves publicist Terry Pettifer made this announcement on Thursday. He said it was confirmed on Tuesday that the highly ranked Thai had contracted hepatitis B.
"It's a great pity," said promoter Rodney Berman.
But it could be a blessing in disguise because there were fears that the experienced former WBC junior lightweight champion, (50 wins, 32 KOs and two losses), could end Hlatswayo's career.
Pettifer said Berman was already looking at securing another opponent.
Hlatswayo has not fought since being outpointed over 12 rounds by American Kendall Holt in November.
According to Pettifer, Hlatswayo's trainer, Many Fernandes, said Hlatswayo looked decidedly jaded in training ahead of that contest, and said the loss had brought the "Angel" down to earth.
The Emperors Palace bill will be headlined by the IBO bantamweight clash between reigning IBO junior bantamweight champion Mbwana Matumla and former IBO bantamweight king Silence Mabuza.
Former WBO heavyweight champion Corrie Sanders will square up to American Chris Koval over 10 rounds, and Khotso Motau will meet American Anthony Little.