Novak Djokovic of Serbia celebrates his win over Dominic Thiem of Austria during the Miami Open presented by Itau at Crandon Park Tennis Center on Wednesday in Key Biscayne, Florida. AFP PHOTO
MIAMI: World No.1 Novak Djokovic was struggling to play his best, but held firm when pressed to the brink on Tuesday (Wednesday in Manila) and battled into the ATP and WTA Miami Open quarterfinals.