World No.1 Novak Djokovic has crushed stricken defending champion Marin Cilic in straights set to storm into his sixth US Open final at Flushing Meadows.

Looking to add a second title to his 2011 crown, Djokovic needed just one hour and 25 minutes on Friday to see off ninth-seeded Cilic 6-0 6-1 6-2 to progress to his fourth grand slam final in a season for the first time.

“Of course it’s a great achievement and I’m very proud of it,” Djokovic said.

“These are the tournaments that you want to perform the best in.

“Grand slams are the most important events we have in tennis.”

The top-seeded Serb will play the winner of the all-Swiss semi-final between second seed Roger Federer and fifth seed Stan Wawrinka.

After battling to find his best form this campaign, Djokovic was merciless against the Croat, who was struggling with an ankle injury.

The top seed dropped serve just once, midway through the third set when the result was a fait accompli, before quickly regrouping to inflict his 13th defeat on Cilic from as many encounters.

Djokovic will now focus on improving his ratio in title matches in New York.

“I haven’t been very successful in the US Open finals,” he said.

“I’ve won one and lost four but still I’ve been very successful and played some of my best tennis here.”