On December 19, 2009, Ragosina defeated heavyweight world champion Pamela London by knockout to add two heavyweight championships to her resume - the WIBF Women's International Boxing Federation heavyweight title and the World Boxing Federation heavyweight title.
On August 29, 2003, she made her professional début, drawing (tying) in four rounds with Geraldine Cox, another promising Guyanan fighter who would later turn into a common opponent for London.
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Her first world title try came on November 28, when she met Martha Salazar for the IWBF's world Heavyweight title.
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