Officials were forced to act quickly during Novak Djokovic's Miami Open semi-final match against Grigor Dimitrov as a "heckler" was removed from the stands after just three games. Dimitrov became aggravated at 1-1 in the first set and the chair umpire rushed down onto the court,

The self-belief of Novak Djokovic remains as strong as ever if the words of his beaten Miami Open semi-final opponent Grigor Dimitrov are anything to go by. On Friday, the Serbian moved to within one win of his 100th career title when he outclassed the Bulgarian 6-2 6-3 to set up a clash with teenager Jakub Mensik.