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David Haye is not worried about Derek Chisora stepping into the ring with Tyson Fury on Saturday and believes his old rival fully deserves the “big, juicy paycheck” coming his way.Veteran Chisora will fight for the world heavyweight title again and attempt to produce a huge shock in his 46th bout by downing his undefeated fellow Briton at Tottenham Hotspur Stadium.Chisora will turn 39 later this month and three consecutive defeats sparked calls for ‘Del Boy’ to quit last winter only for the Finchley fighter to beat Kubrat Pulev on points in his most recent outing at the O2 Arena in July.It put external talk of retirement on hold for the Harare-born boxer but he now faces a big step up in class when a trilogy occurs with Fury, who has knocked out his last three opponents and swept aside Chisora in 2011 and 2014.