Before 9th June, 2012, only Rustico Torrecampo (Phillipines), Medgoen Singsurat (Thailand), and Érik Morales (Mexico) could legitimately claim to have done it. They are now joined by Timothy Bradley (USA), though in the eyes of many experts, the word "legitimately" may not be applicable.
What is this all about?
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Manny Pacquiao, the legend-in-his-own-lifetime boxer from the Phillipines has lost to these boxers in his professional career. The latest loss to Bradley brought to an end, an unbeaten streak of over 7 years. This fight's conclusion was very controversial, with Pacquiao landing more punches.
See this for a brief match summary.