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			 The 33-year-old Swiss, who spent two hours 48 minutes defeating 
			compatriot Stanislas Wawrinka in a brutal semi-final the previous 
			night, announced his decision on court as the 17,000-seat O2 Arena 
			filled up. 
 It meant Djokovic became the first man to win the title three years 
			in succession since Ivan Lendl in 1987.
 
 World number two Federer, who was bidding for a seventh title at the 
			year-ender, apologised but told the crowd he was not "match-fit" 
			after developing a back problem.
 
 Looking as stylish as ever as he stood on the blue indoor surface 
			wearing a red and grey cardigan, Federer apologised, saying: "I hope 
			you understand I wanted to come out personally and excuse myself for 
			not playing ... I can't compete without a back at this level."
 
 Despite the huge anti-climax for the crowd, some of whom had forked 
			out thousands of pounds for a courtside ticket, there was no booing, 
			with applause breaking out as seven-times Wimbledon champion Federer 
			spoke.
 
 
			 
			Explaining how the injury arose, Federer said later: "I was feeling 
			great until yesterday's tiebreaker. I felt all of a sudden the back 
			was feeling funny.
 
 "I tried to have treatment on it, medication, just tried to turn 
			around as quick as possible really, but didn't really feel much of 
			an improvement overnight."
 
 It was only the third time in a career spanning nearly 1,000 matches 
			that Federer has withdrawn because of injury.
 
 Djokovic was not really in the mood for celebrating when he 
			collected the trophy and a $1.92 million cheque.
 
 "Obviously not the way I'd like to win this," said the 27-year-old, 
			who clinched the year-end world number one ranking for the third 
			time in four years this week.
 
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			"I feel sorry for Roger. I've been in tennis 10 years and I know 
			Roger and Rafa (Nadal) have been the biggest competitors and always 
			give their 100 percent. If Roger could have come out and played he 
			would have played.
 "I'm not the kind of player to celebrate these wins, but I have to 
			celebrate the whole season and this trophy is the crown on the 
			season," he added.
 
 To appease disappointed fans, home favourite Andy Murray, thrashed 
			by Federer in the week, agreed to play Djokovic in a one-set 
			exhibition match, before partnering John McEnroe in a doubles game 
			against Tim Henman and Pat Cash.
 
 Federer now faces an anxious week as he tries to recover for the 
			Davis Cup final against France in Lille next weekend.
 
 Along with the Olympic singles title, the Davis Cup is the major 
			honour which still eludes the 17-times grand slam champion, with 
			Switzerland's hopes resting on the shoulders of him and Wawrinka.
 
 "The way I feel right now there's no way I can compete at any level 
			really," Federer said. "Probably in a few days it's going to be 
			better."
 
 (Editing by Mark Meadows and Ian Chadband)
 
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