World number one Novak Djokovic staved off a spirited challenge from Federico Delbonis for a 7-5, 4-6, 6-1 win in the third round of the Miami Open on Sunday. Like Roger Federer the previous day, top seed Djokovic found it tough going against an unseeded opponent before prevailing in two hours in the Florida twilight.

Miami Open: Novak Djokovic defeats Federico Delbonis to enter fourth round

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Miami Open: Novak Djokovic defeats Federico Delbonis to enter fourth round