Briton Anthony Joshua lived up to his billing as the new superstar of heavyweight boxing as he stopped Charles Martin in the second round to claim the American's world International Boxing Federation (IBF) title. Joshua became the first boxer in history to hold the Olympic super heavyweight crown and a version of the world heavyweight title simultaneously with his stunning triumph at the O2 Arena, a few miles from where he won gold at the London 2012 Games. The 26-year old Briton handed Martin the first defeat of his career to annex the title in his 16th professional fight, knocking him down twice in the second round with magnificent right hands.<br/><br/>