`` I 'm not leaving 140lb until I unify the title . British world champion Amir Khan retains his WBA light - welterweight title . The 23-year - old Khan defeated American Paulie Malignaggi in the 11th round . The Madison Square Garden fight marked Khan 's big - fight debut on American television .
British world champion Amir Khan retains his WBA light - welterweight title . The 23-year - old Khan defeated American Paulie Malignaggi in the 11th round . The Madison Square Garden fight marked Khan 's big - fight debut on American television .