(Orange County, CA) – – International Boxing Federation has confirmed that promoters of rising bantamweight stars Yonnhy Perez and Silence Mabuza have reached an agreement for the fighters to battle it out for the IBF #1 mandatory position on April 18, 2009 in South Africa. Co-promoted by Thompson Boxing Promotions and Gary Shaw Productions, Colombian born Yonnhy Perez (18-0, 13 KO