LONDON -- Roger Federer pulled out of the ATP Finals less than one hour before his title match against Novak Djokovic on Sunday, handing a third straight title in this event to the top-ranked Serb and dealing a potential blow to Switzerlands Davis Cup ambitions. The 17-time Grand Slam champion said he hurt his back in the nearly three-hour semifinal win over Davis Cup teammate Stan Wawrinka on Saturday night in which Federer saved four match points. Unfortunately Im not match fit, the 33-year-old Swiss told the crowd at the O2 Arena. I tried everything I could last night, also today: painkillers, treatment, rest, so forth, warm-up, until the very end. But I just cant compete at this level with Novak. It would be too risky at my age to do this right now and I hope you understand. Fans appeared to be supportive with applause for Federer when he spoke. Federer is set to play for Switzerland in the Davis Cup final against France, starting Friday. If he recovers in time, Federer will be chasing the only major trophy still eluding him. France hosts the match in the northern city of Lille. Following back problems that ruined his 2013 season, Federer enjoyed a superb resurgence this season, losing to Djokovic in an epic Wimbledon final and adding five new titles to his collection. Federer, the most successful player at the ATP Finals with six wins, also made it to the semifinals at the Australian Open and the U.S. Open and won his 23rd Masters title in Shanghai last month. He remained on course for the year-end No. 1 spot until this week and had dropped just one set on the way to the final. I hurt my back late in the match yesterday against Stan, I am very disappointed and I hope to be feeling better soon, Federer added on his Facebook page. Its been an extremely difficult decision because I love playing in London and the ATP World Tour Finals have been an absolute highlight of my career. Unfortunately, my back problem does not allow me to play right now. Djokovic became the first player since Ivan Lendl from 1985-87 to win the year-end event three times in a row. He finished the season No. 1 for the third time in four years, becoming the seventh man to accomplish the feat at least three times. Besides winning his seventh Grand Slam title at the All England Club, Djokovic was also runner-up at the French Open, and won six titles. Instead of facing Federer, Djokovic is playing an exhibition set with Andy Murray, before a doubles match pitting Murray and John McEnroe against Tim Henman and Pat Cash. Fran Tarkenton Jersey . The two-time Olympic halfpipe gold medallist informed ESPN on Monday he plans to compete in Apsen, Colo. Custom Minnesota Vikings Jerseys . The Marlies centre set up three goals, including the game-winner, as Toronto cruised to a 4-1 victory over the Oklahoma City Barons in American Hockey League action. http://www.authenticvikingspro.com/Dalvi...vikings-jersey/. Ryan Getzlaf certainly got them started in the second. Getzlaf scored the first two goals in the second, and Teemu Selanne scored the go-ahead goal late in the period as the Anaheim Ducks beat the Nashville Predators 4-3 Thursday night. Chris Doleman Jersey .Voegele will next play Anna Schmiedlova of Slovakia, who saved 10 of 16 break points to defeat Annika Beck of Germany 7-6 (6), 6-4.Also, Marina Erakovic of New Zealand defeated eighth-seeded Caroline Garcia of France 6-2, 4-6, 6-4. Brett Favre Jersey . The deals were announced on Friday. Beckham will receive $4.175 million in base salary, while De Aza will receive $4.25 million. Beckham hit .267 with five home runs and 24 RBIs over 103 games last season, his fifth with the White Sox.WASHINGTON -- A U.S. judge has refused to dismiss the governments lawsuit against disgraced cyclist Lance Armstrong and associates for alleged doping and use of banned performance-enhancing techniques. From 1999 to 2004, Armstrong was the lead rider on a team sponsored by the U.S. Postal Service, and he won the Tour de France every year during that period. On Thursday, Judge Robert Wilkins ruled in favour of the governments position that Armstrong and associates owed an obligation to pay money due to the alleged breach of the sponsorship agreements with the Postal Service. The Postal Service paid about $40 million to be the title sponsor of Armstrongs teams for six of his seven Tour de France victoriies.dddddddddddd The judge said the governments complaints are rife with allegations that Armstrong had knowledge of the doping and that he made false statements to conceal it. The Justice Department says the cyclist violated his contract with the U.S. Postal Service and was "unjustly enriched" while cheating to win the Tour. The Justice Department stepped into the case last year, joining a whistleblower lawsuit brought by former Armstrong teammate Floyd Landis under the federal False Claims Act. Wilkins, a newly appointed appeals judge for the U.S. Court of Appeals for the District of Columbia Circuit, is sitting as a U.S. district judge in the lawsuit against Armstrong. 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