LONDON -- Roger Federer had never lost his opening match at the ATP World Tour Finals since the elite tournament moved to London in 2009. Until now, that is. On the back of a chaotic and disappointing season, the former World No. 1 was beaten on Tuesday for the second time in less than a week by defending champion Novak Djokovic 6-4, 6-7 (2), 6-2. The Serb extended his winning streak to 18 matches after capturing his sixth title of the season last week in Paris, where he defeated Federer in the semifinal. Djokovic kept alive his chances of overtaking Rafael Nadal in the race for the year-end No. 1 spot. "It was a big challenge physically," Djokovic said. "Only 48 hours ago I was playing in Paris, so to be able to play this well and beat Roger is incredible. "I have to enjoy the win and then think about the recovery because its a big win. The good thing is, there is a day off. Im going to try and recharge my batteries mentally and physically and get ready for (Juan Martin) Del Potro." Djokovic is attempting to finish No. 1 for the third year in a row but Nadal, who eased past David Ferrer 6-3, 6-2, needs only a win against Stanislas Wawrinka on Wednesday to be guaranteed the top spot. This 31st encounter between Federer and Djokovic -- a remake of last years final -- produced a somewhat disjointed match laced with unforced errors and flashes of brilliant tennis leaving both players looking exhausted toward the end of the match. "Again, I was able to recover from all those matches and actually felt physically somewhat fine," said Federer, who won his last Grand Slam title at Wimbledon in 2012 and has only two victories against top-10 opponents in 2013. "So I regret not having taken my chances better maybe." Federer, the oldest man in the draw at 32, refused to draw early conclusions from a season in which he had back problems and dropped to seventh in the rankings. "The season is not done yet," he said. "Lets talk about this stuff in hopefully four matches." Federer and Djokovic neutralized themselves until the ninth game when the Serb was down 15-30. A double fault gave Federer his first break point, but he sent a forehand wide on the next point. Djokovic then took the next two points to hold his serve. The Serb earned two break points in the next game with a superb backhand return. The cheering from the legion of Swiss supporters packed in the stands didnt help Federer as he fluffed a forehand to lose the set. After rallying from 0-40 to break Djokovic for a 3-2 lead in the second set, Federer dropped his serve in the next game. He double-faulted after Djokovic earned a break point with a backhand that hit the net cord before going over. Serving for the set at 5-4, Federer made another unforced error on his usually reliable forehand to squander a set point. Djokovic seized his chance, sending Federer in the ropes with a stretched crosscourt winner before levelling at 5-5. Federer smashed a ball toward the scoreboard hanging over the court in frustration. Federer kicked back into life in the tiebreak, winning the last five points with a string of beautiful shots that included a backhand volley, a crosscourt winner, and a perfect lob that Djokovic failed to return. Djokovic looked unfazed at the start of the third set to break Federer at love. He then saved a break point to consolidate his lead before taking Federers serve again after a long rally for a 4-1 lead. He sealed the match on his first chance. Despite his easy win, playing indoors will never be ideal for Nadal. The Spaniard has won all four Grand Slam tournaments and the Olympic title in his career but has never triumphed at the season-ending ATP World Tour Finals. "I like the sunshine," Nadal said when asked about the difference between playing indoors and outdoors. "The feeling on the ball, on your racket, is different" when playing indoors, Nadal said. "All of these small things that make you feel a little bit strange." The conditions didnt seem to bother him Tuesday as he beat fellow Spaniard Ferrer 6-3, 6-2 on the indoor court at Londons O2 arena. "Im happy. The court is in perfect condition here," Nadal said. "Its a good start for me, positive one." Nadal came close to winning the event in 2010 when he lost in the final to Federer. He didnt play last year because of a knee injury that kept him away for seven months before his successful comeback in February. The 13-time Grand Slam champion traded early breaks with Ferrer and then began dictating play from the baseline, forcing Ferrer into errors. Nadal converted six of seven break points, and Ferrer had 33 unforced errors. "He arrived a little bit tired after playing the final (in Paris)," Nadal said. "I played with a little more calm than the other day (against him)." Nadal earned his 21st win in 26 matches against Ferrer, but only his first indoors. Nadal and Ferrer play in Group A, along with Stanislas Wawrinka, who beat Tomas Berdych in his opening match on Monday. Djokovic and Federer are in Group B with Juan Martin del Potro and Richard Gasquet. Aqib Talib Rams Jersey . Ricciardos exclusion from the results tarnished what had been a day of celebration for local fans, who were jubilant that the Red Bull driver had apparently become the first Australian to finish on the podium at his home race. However just before midnight, stewards ruled that Ricciardos car had "exceeded consistently the maximum allowed fuel flow" and that the team refused an instruction from the races technical delegate Charlie Whiting to change the fuel-flow sensor before the race and a further request during the race to reduce the fuel flow. Los Angeles Rams Jerseys . -- Canadian Erik Bedard pitched into the fifth inning in his bid to win a spot in Tampa Bays rotation, helping the Rays beat the Toronto Blue Jays 6-3 on Saturday. http://www.ramsrookiestore.com/Rams-Brian-Allen-Jersey/. Louis, MO (SportsNetwork. Ndamukong Suh Jersey . -- During Kansas shootaround on Wednesday before the Jayhawks faced Oklahoma, coach Bill Self told Wayne Selden Jr. Joseph Noteboom Jersey . In a series of tweets, it is explained by the Department of Player Safety that Niederreiter makes full body contact with Burrows and although there is head contact, he does not "pick" the head in the course of making the hit.Lee Westwood claims the Ryder Cup is not on his mind as the Englishman targets a strong finish to the season. Westwood, who has never won a major but was joint runner-up at this years Masters, failed to challenge at The Open but finished well with a three-under-par 68 final round.The Worksop golfer gained some valuable points with a solid but unspectacular display at Royal Troon, where he finished one over par overall. Leaderboard The 145th Open And with thoughts turning to The Ryder Cup at Hazeltine, the 43-year-old says he has no thoughts on the tournament in which he has won 18 out of the 37 matches he has taken part in, collating a total of 21 points.Westwood is currently outside the automatic qualification places in Darren Clarkes team but could still make a 10th appearance for Europe this autumn. The Worksop golfer has won 18 out of 37 matches in Ryder Cup He said: Im ticking over picking points up all the time. My consistency is good but I am not really thinking about the Ryder Cup.Im thinking about playing well week-in, week-out and trying to get a win sooner or later. My form is certainly good enough. Westwood is currently outside the automatic qualification places in Darren Clarkes team Westwood believes he is playing at a high levell and is taking positives from the four days in Scotland as he prepares for the final major of the year at Baltusrol Golf Club in New Jersey.ddddddddddddHe said: I played poorly the first three days and struggled with my swing a bit. On the first day I was three over after 10 and you cant afford to do that on this golf course.But I may finish inside the top 20 here, so Im playing at a high level.I think any time you finish with a 68 in a major championship you have to take some positives away. Its nice to have something to work on and take it to the PGA Championship.Another Englishman, Matthew Southgate, admitted he was in tears as he walked down the 18th hole, 12 months on from undergoing surgery having been diagnosed with testicular cancer.Words cannot describe how that felt walking down that last hole, said the 27-year-old. 69 is a hell of a score for me on a day which meant so much.I knew where all the family was and there was a big tear rolling down my face when I reached the front of the 18th green. Ive wanted to do that since I was 10 years old and to get out there and do it - words cant describe.I always had the belief inside me Id get over the health issues and be back in an Open Championship but to do it within the year and to have my family here...it is a big achievement for me.If you had asked me last year Id have said it was possible for me to qualify but to finish up there comfortably in the top 20 - no one would have had a bet on that. 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