Novak Djokovic may occasionally get tired and need some R&R after a long match or tournament. But professional tennis’ No 1 joker doesn’t ever let the chance for a laugh slip by. So Friday morning, which found the current world No 1 at the Burj Al Arab’s sea turtle rehabilitation centre, tasked with naming one of the animals having treatment, provided the perfect opportunity. “I name him Leonardo,” said the Serbian player, who didn’t immediately explain his choice of name.