Novak Djokovic has won through to his fourth final at the Miami Masters with a straight-sets victory over Juan Monaco.

The Serbian, who is defending his title in Florida, was in devastating form in the first set as his power from the back of the court saw him take it 6-0 in just 28 minutes.

World number 21 Monaco managed to impose himself on the second, but Djokovic found a break of serve to establish a 3-2 lead.

The Argentine nearly broke back instantly when he had two break points, but the Australian Open winner dug deep to take the game.

Monaco again had two break points as he attempted to bring himself all square at 4-4, but once again Djokovic held his nerve to put himself 5-3 ahead.

The Argentine then held his next service game before he finally broke Djokovic to level the set at 5-5.

Both players then held to take the set into a tie-break, which saw the world number one eventually prevailing 7-5.