'It's been an incredible season' - Novak Djokovic

A proud Novak Djokovic reflected on an "incredible season" after winning his third grand slam of the year with his US Open victory.

The world number one secured a 6-4 5-7 6-4 6-4 victory over Swiss great Roger Federer to win his 10th career grand slam title and third of an impressive 2015.

Only the French Open crown eluded Djokovic, who was beaten in the final at Roland Garros by Stan Wawrinka.

The 28-year-old Serbian reflected with pride on his season, which was his second three-slam campaign after 2011 - when his only miss also came in Paris.

"It's been an incredible season. I'm very fortunate to experience a great success this year," Djokovic said.

"The season is not over, but the grand slam is over. The biggest tournaments that I have played this year, as anybody else, and I won three out of four. It's more than I could ask for, definitely.

"Of course I do have lots of expectations and high ambitions whenever I'm approaching the grand slams or any other tournament, but now actually sitting down here with this trophy and reflecting on what I have achieved, it's quite incredible."

Djokovic appeared to be in trouble during the third set, only to save two break points in the eighth game before breaking in the ninth.

He said taking the third, after coming from 15-40 down when serving for it, was the boost he needed.

"Just being mentally tough and trying to hang in there and play point by point [made the difference]. Obviously much easier said than done," Djokovic said.

"I was aware that he was going to come out with a clear game plan to pressure me and come to the net and mix up and come second serve, come to the net, as well.

"Just take out time from me. Because I like to have a little bit more time. That's my style of game. He likes one-, two-, three-shot points. He loves to play quick.

"You could feel the momentum was switching from my side to his side for, I think, all the way till the end of the third. It was anybody's game. It was really even.

"When I managed to break at 4-4 and managed to hold after saving couple break points in 5-4 and winning the third set, that obviously gave me a huge wind in the back, and I managed to play really well after that.

"5-2 serving [in the fourth], I thought, 'OK, now this is the time to finish it off,' but it wasn't. He showed once again why he's competing in such a high level for so many years.

"Again, he never stepped back, and he always made me play an extra shot, extra shot, kept pushing. Yeah, I was fortunate to come up with some big serves when I needed to. Serve was not really a strong link tonight for me, but in the important moments I got a couple of free points in the last game on serve, and that's what matters."