ating ▁Dia z ▁by ▁knock out ▁in ▁round ▁ten . ▁He ▁def ended ▁that ▁crown ▁with ▁a ▁decision ▁in ▁twelve ▁over ▁D anny ▁Pere z ▁Ram í rez ▁and ▁a ▁knock out ▁in ▁two ▁over ▁former ▁W BA ▁title ▁holder ▁Andrew ▁Lewis . ▁Lewis ▁was ▁a ▁south p aw ▁and ▁a ▁hard ▁p unch er , ▁but ▁had ▁been ▁exposed ▁as ▁having ▁a ▁weak ▁ch in , ▁while ▁Mar gar ito ▁proved ▁that ▁he ▁has ▁a ▁world ▁class ▁ch in . ▁He ▁public ly ▁asked ▁for ▁a ▁un ification ▁bout ▁with ▁then ▁W BC ▁and ▁W BA ▁Champion ▁Ric ardo ▁May org a . ▁ ▁At ▁this ▁point , ▁Mar gar ito ▁considered ▁going ▁up ▁in ▁weight ▁to ▁try ▁to ▁l ure ▁Fernando ▁V arg as , ▁Oscar ▁De ▁La ▁Ho ya ▁or ▁Sh ane ▁Mos ley ▁into ▁a ▁luc r ative ▁fight , ▁or ▁Santos ▁into ▁a ▁rem atch ▁at ▁the ▁light ▁middle weight ▁division . ▁On ▁October ▁ 1 7 , ▁ 2 0 0 3 , ▁Mar gar ito ▁made ▁his ▁light ▁middle weight ▁division ▁debut ▁with ▁a ▁two - round ▁knock out ▁win ▁over ▁Maurice ▁Br ant ley ▁in ▁Phoenix , ▁Arizona . ▁ ▁On ▁January ▁ 3 1 , ▁ 2 0 0 4 , ▁back ▁in ▁the ▁wel ter weight ▁division , ▁he ▁retained ▁his ▁title ▁with ▁a ▁second - round ▁knock out ▁of ▁Canada ' s ▁previously ▁und efe ated ▁Her cules ▁Ky vel os . ▁ ▁Mar gar ito ▁faced ▁Daniel ▁Santos ▁in ▁a ▁rem