Boxing promoter Frank Warren has sensationally revealed that Daniel Dubois has no contractual obligation to give Anthony Joshua a rematch. Dubois won the inaugural IBF interim heavyweight title following a stunning win over Filip Hrgovic last June . The knockout win over the Croatian earned himself a whopping blockbuster showdown with Joshua - a two-time heavyweight champion - at Wembley Stadium, London, three months later. 'AJ' was a huge favourite going into the heavyweight dust-up as the