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. Addison Reed Jersey . His stated reason for abruptly resigning as head coach of Canadas Olympic womens hockey team was he felt there were doubts about his ability to coach the team to Olympic gold in February. Zach Duke Jersey . For the first time all night, as the Raptors were on the clock to make the 20th overall selection, no one had the slightest idea what was about to happen. No leaks, no whispers, nothing. http://www.twinsrookiestore.com/Twins-Mi...no-Kids-Jersey/. Moments after his Brooklyn Nets teammates ran out onto the court to congratulate him following their 100-98 overtime win over the Phoenix Suns on Friday night, Johnson could only shake his head at scoring only 13 points on 6-of-19 shooting. Fernando Rodney Jersey . -- The Oakland Raiders added a veteran presence to their young receiving group by signing free agent James Jones to a three-year contract Monday. Harmon Killebrew Jersey . It was the most lopsided loss in Lakers history. Darren Collison had a team-high 24 points while starting at shooting guard for the injured Jamal Crawford. Chris Paul added 13 points and 11 assists for the Clippers, who apparently are trying to make up for decades of humiliation at the hands of the Lakers all in one season; theyve won the last two meetings by a combined 84 points.When youre in Toronto, what are some of the things you like to do? I know you like to bike around Toronto.For sure, my first time in Toronto was in 1997 when I was in high school. The thing I remember about 1997 was all the underground tunnels we got to go through. The next time I got to go Toronto was 2006. I enjoy riding bikes, the rental bikes, I think it used to be called bike share it used to be known as Dixie for a number of years. Ive also spent time up there in Yorkville for the film festival. Ive been to Kensington Market. I enjoy walking up and down Queen a ton; I enjoy the boutiques and shopping and also some of the sneaker sports west of Spadina. I just enjoy being around the city; I think its one of the great cities certainly in North America and in the world.Sticking on the topic of shoes, you have a shoe vault?I do, I have a shoe vault in my house just a concrete room. We put a vault there on it just to top off the look.How many sneakers do you have? Whats your favorite pair?I have around 400 sneakers. Most of them are Jordans, I got some of my Air Jordans when I was in high school and my first pair were black and white patent leather concord 11s which came out in 1996 and I still have those in the original box. I have my original Air Jordan 4s from 1989 that I kept, but those are obviously falling apart and crumbling. Ive also collected a number of pairs that I like since than as well.Sticking with Canada, youre a big fan of Avril Lavigne, no?Yeah I am. Great Royals win & perfect concert to top off the night! Be good @brian_littrell @skulleeroz & @kevinrichardson #BSB pic.twitter.com/jRnAhwohfr — Jeremy Guthrie (@TheRealJGuts) June 8, 2014I really enjoy her music. Shes one of those artists, one of four people, that Ill actually go to the store and buy their record. The four are Avril Lavigne, I really enjoy The Backstreet Boys, I really like Justin Timberlake and Justin Bieber. Ill go buy all of their music, the hard copies. Avril is one of those artists I can listen to all of her songs on all of her albums, and I have them all. Her voice is unique and I really enjoy her music.Whats your go-to Avril song?I like all of the albums, they are all different, so the most recent album Avril Lavigne my favorite song by far on that one is Falling Fast.Its a slow song, one of those ballad type songs that I really like when she has those. Going back toGoodbye Lullaby, I really like the song I Love You.When you get a chance to listen to the songs, she has so many great records that every album I appreciate all of them.Shes been getting a lot of flack for the Hello Kitty song, critics have been calling it racially insensitive, what are your thoughts on it?I didnt take it that way [laughs], and ironically Im half Japanese. I didnt take it offensively. One thing I do know about her is that whenever she goes over to Asia and she performs shes over there in front of huge sell out crowds and arenas, I know that shes really appreciative of her fans over there. I dont know how exactly how you would take it, but when I first heard it, it seemed like she was writing it for her fans overseas. Its a catchy song.Whats your go to Bieber song?Oh man, all of them, theres not a bad song on any of the albums. Before games Ill usually pop in All Around The World, As Long as You Love Me or Boyfriend on occasion. Actually, one of my favorite songs hes done is the one hes recorded with Chris Brown. Obviously hes had his struggles outside of music, but in terms of just the music, I definitely think hes come up with some of his best songs on his latest albums.So what about The Backstreet Boys, is that a band you grew up with and its just stuck with you through the years?When The Backstreet Boys had just become popular in the U.S, they were already popular in Europe prior to their arrival here in North America, they had just come out with As Long As You Love Me, right as I was graduating high school in 1997. That song was catchy and they released a few more singles when I was in college and I got to here it a bunch. Than I moved to Spain, and over there I heard a bunch more of their music, and around that time thats when Millenium came out and although I wasnt in the U.S., I heard and saw a lot about them and they released more albums that I enjoyed. I was intrigued by them and watching them be interviewed and talk, they just seemed like a good group of guys..dddddddddddd.Do you ever take any flack from your teammates regarding your music taste?Oh yeah, all the time [laughs]. I appreciate the fact I can listen to the music I like with my kids and listen in front of anybody and although they may not like it, you cant really be offended by it. Where as a lot of the music my teammates like is music that you wouldnt probably play anywhere outside of a clubhouse or in your headphones because it can get a little bit rough.Whos got the worst music taste on the team?For sure [Royals outfielder] Jarrod Dyson. I cant even listen to their songs, whenever their songs come on I tell them "That was my favorite song, please play it again," and they actually take me seriously and replay it and its like the worst song Ive ever heard.You had some words for Fifty Cent after that pitch, what did you think of it? @50cent Ummm, 50? Clearly that pitching lesson did absolutely NOTHING for you tonight! Time to regroup haha. pic.twitter.com/q5oejhPGEZ — Jeremy Guthrie (@TheRealJGuts) May 28, 2014Well, it was terrible, really bad. You just take for granted that someone can put a ball in their hand, be it a baseball, softball or any type of ball, and that they should be able to throw it somewhat straight. Mechanically, they may look funny, they may have a funny arm motion or whatnot, but it just seems it would be relatively simple or elementary to be able to throw it straight. So to see how that came off of his hand, the trajectory towards the camera man, it was just really funny. It was so bad I was wondering if he was just joking or if he wanted to make it funny, because if it was just to be funny it was really good. If it wasnt than it was pretty bad.What pitching advice would you give him?Practice, you need to practice [laughs]. If thats what you got youve got practice a bit more.If you werent playing baseball what would you be doing?Id like to design shoes. Thats what I always wanted to do. Im not real artistic but Id like to think that if someone else could help me or I could tell them yes or no on what things I like. I always planned on working for Nike, which was kind of my childhood dream. Whether its an actual shoe design or just retail or advertising, its something Im passionate about and I would love to dedicate time and thought towards a job involving sneakers and the growth of a brand I really appreciate.What would a Jeremy Guthrie sneaker look like?Hm.. Im not totally sure. It would probably have patent leather, thats one of my favorite materials that they put on any of the shoes. I just recently learned that Nike has this big book with hundreds and hundreds of different materials that you can put on different shoes, and I never knew that. You get kind of used to seeing the same ones over and over, whether its a safari print, patent leather or flywire which weve seen more recently on shoes. So Im not totally sure what the shoe would look like but Id certainly mix in some of the different materials that youre not accustomed to seeing as often.What would someone be surprised to know about you?They would be surprised to know that in fifth grade I was Oregon State chess champion and that in sixth grade my four-man team competed in the national tournament in Westchester County, New York, where we placed eighth out of more than 300 elementary six grade and younger chess teams.Changing topics a bit, are you a big movie guy?Im relatively diverse, my favorite movie, which will probably make you laugh its kind of like my favorite music its a little bit different, is probably Serendipity with Kate Beckinsale, John Cusak and Jeremy Piven.I love the story of it, I love the humor and I dont mind seeing Kate Beckinsale in the movie either. I also like A Few Good Men, Back to the Future and The Social Network, the latter I was fascinated with the storyline and how they tell it, and I thought it was so well done, Justin Timberlake and the other actors were amazing in it. I really like Iron Man, I dont really care for the sequels, but the first one if probably the best action hero movie in my opinion.What other sports are you a big fan of?I love basketball, I played it growing up and I also love American football. I cheered for the Los Angeles Rams in Football, and the Chicago Bulls in basketball.Jeremy also shared some of his favorite pictures hes taken when hes been in the Toronto area. 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