LONDON: Olympic champion Anthony Joshua will have the chance to add a world title in the paid ranks to his trophy cabinet when he faces IBF heavyweight strap-holder Charles Martin in April. Briton Joshua, who won super-heavyweight gold on home turf in 2012, is one of the most highly-rated young fighters in boxing having built up a perfect record of 15 knock-outs from 15 fights. And the 26-year-old, who won the British title in his last fight, will get the chance to add a world belt to his collection on April 9 at the O2 Arena in London. American Martin, 29, won the IBF belt when Polish opponent Vyacheslav Glazkov retired with an injury from their bout last month after tearing knee ligaments during the fight. The IBF belt had only become vacant after Tyson Fury stunned Wladimir Klitschko in November to also claim the WBA and WBO titles.