Novak Djokovic has revealed he was inspired by his father's blood disorder battle for his spectacular victory over Roger Federer in the ATP World Tour Finals.

"Having my father fighting for his health gave me extra strength that I wanted to play for him in a way," Djokovic said after dethroning Federer.

"That's one of the reasons I really gave it my all every match, especially tonight. This was a title for him.

"He's much better now. The reason why I was reluctant to talk about it is because I don't think that's a subject for media. I don't want people to start talking about my father's health.

"But it's something that happened over the last couple of weeks. At a certain stage, it was very critical. We didn't know what tomorrow brings.

"Now he's much better and he's recovering. He's still in intensive care. I'm going to visit him tomorrow and see how it goes and try to bring a trophy with me and at least make him smile."

Novak Djokovic put a firm stamp on his position as world number one after scoring a stunning victory over Roger Federer in the ATP World Tour Finals.

The Serb won 7-6 (8-6) 7-5 to add the season-ending title to his Australian Open victory and top ranking.

He needed two hours and 14 minutes to take two sets in a match of dramatic swings in momentum.

It is the second time Djokovic has won the ATP finale, following his triumph in Shanghai four years ago.

"It's been two very successful years," Djokovic said. "I didn't really know how I would follow up after an incredible 2011.

"I just believed I had to use the time where I'm playing the best tennis of my life to finally realize what I need to do to win the major tournaments.

"This was my time, my moment, and I really needed to believe in my ability.

"So throughout the whole season I've had lots of success and had some disappointing losses at big events, in a couple major finals. But, you know, all in all, it's tremendous.

"It's very satisfying for my team and myself to conclude this fantastic season with a World Tour Finals win.

"I wanted really to fight and get as far as I can in this tournament. Winning all the matches I played makes it even more special.

"I was playing really great tennis throughout the whole week. Tonight whenever I needed to, I came up with some really good shots. I cannot be more thrilled than I'm feeling now."

We need your support so Novinite.com can keep delivering news and information about Bulgaria! Thank you!