Novak Djokovic beats Roger Federer to win ATP World title

Novak Djokovic put a firm stamp on his position as world number one with 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.
"I was just trying to hang in there," said Djokovic.
"It's not the first time that Roger started so well against me. I've experienced before his aggression, really trying to put his mark on the match."
He added: "Whenever I needed to come up with some really good shots - really focus myself and get every ball back in the court - I did that, so I cannot be more thrilled than now."

- BBC.co.uk