LONDON -- Theyre still in their 20s, yet their rivalry is already one of the most heralded in mens tennis history. Rafael Nadal vs. Novak Djokovic has become a classic. The pair met for the first time at tour level seven years ago and, when they go head-to-head in the final of the season-ending ATP World Tour Finals on Monday, it will be for the 39th time. The Spaniard and the Serb have been dominant this season, with Nadal replacing Djokovic for the No. 1 ranking last month on the back of a stunning comeback from a career-threatening knee injury. "Whenever we play each other, its a huge challenge," the 26-year-old Djokovic said. "This is the probably the most competitive tournament that we have after Grand Slams in our sport, and we both want to crown this season in the best possible way and end it with a title." Djokovic extended his winning streak to 21 matches since losing in the U.S. Open final to Nadal when he beat Stanislas Wawrinka 6-3, 6-3 in the semifinals. Nadal had earlier dispatched his old rival Roger Federer in straight sets. The worlds two highest-ranked players are unbeaten this week and have faced each other five times this season, with Nadal leading the 2013 meetings 3-2. After losing a set in each of his three previous matches, Djokovic raised his game on Sunday, making only 14 unforced errors as he broke Wawrinka four times. "The performance was definitely by far the best Ive had in the tournament," said Djokovic, who is bidding for a third title at the elite, season-ending event and has been the best player of the indoor season. Nadal ended Federers hopes of finishing a disappointing season on a high note, defeating the six-time champion 7-5, 6-3. He leads Djokovic 22-16 in their career head-to-head record, although he lost their previous encounter last month in Beijing soon after regaining the top ranking. "After the U.S. Open final, I havent lost a match," Djokovic said. "Im trying to take a lot of positive energy out of this confidence and out of this run. I won against him in the finals of Beijing in straight sets and I played a great match. I liked the way I improved in our matches. I like that I changed a few things that allowed me to win against him. Thats something that I will definitely try to use tomorrow. " Nadal, who claimed his first win over Federer on an indoor hard court, extended his winning career record over the 17-time Grand Slam winner to 22-10 and has now beaten the Swiss player on every surface. Federer had won their four previous matches at the ATP Finals, dropping only one set. "The most important thing for me is (that indoor) is the toughest surface for me to play," Nadal said. "The most difficult for me was to be able to win four matches against top eight players. Its a very good way to finish the year." Chasing his first title at the Finals, Nadal played down the importance of the victory over his greatest rival. "It is probably one of my best seasons," said Nadal, who returned to the tour in February after a seven-month injury layoff. "The most satisfying thing is always (to win) the tournament more than the personal victories. So for me it is more important to be in the final in the last tournament of the year than to have the chance to win against Roger." Since returning from injury, Nadal has won 75 matches --losing only 6 --to win 10 titles including the French Open, the U.S. Open and five Masters 1000 events. Federers season was very different. Hampered by a back injury, he won only one title in 2013 and was hoping to secure a major trophy before the year-end break. He played aggressively early on but faded after losing the first set, making too many mistakes to threaten the Spaniard. "In the beginning, his serve worked very well," the 27-year-old Nadal said. "My feeling is that in the first set, he played very well. He was closer than me to have the break. So in my opinion until 4-all, he was playing better than me." Nadal and Federer treated the O2 Arena fans to some superb exchanges early on, reminiscent of the classic matches that have punctuated their nine-year rivalry. But Nadal was much sharper on the important points, converting all four break points he earned. Federer had 32 unforced errors and made some uncharacteristic poor volleys. Federer, who beat Juan Martin del Potro on Saturday to qualify for the semis while Nadal had a rest day, also appeared to fatigue near the end. Federer failed to convert three break points in the sixth game before Nadal took advantage of his first opportunity to break for 5-4 with a superb forehand winner. Federer broke back immediately, but failed to build on the momentum. He dropped his serve in the very next game before conceding the set. He then struggled with his rhythm and was broken twice in the second set. "I struggled to stay consistent enough throughout the match, and thats why he deserved to win" Federer said. "This game is a game of making or missing your opportunities." Rick Fox Jersey . The young man, never lacking confidence, thought he could be really good. Jaylen Brown Jersey .com Tour title, closing with a 6-under 64 for a four-stroke victory. The 22-year-old former North Texas player finished at 12-under 268 at Panama Golf Club and earned $112,500 to jump from seventh to second on the money list with $171,500. https://www.cheapceltics.com/. Sam, who joined the Cowboys in early September, has spent the entire season on the practice roster. Custom Boston Celtics Jerseys . Not only that, when Julian de Guzman first stepped on the pitch for Deportivo de la Coruna he became the very first Canadian to play in Spains top tier. Paul Pierce Jersey . Colorado came up big against Chicago last spring, and repeated that performance Tuesday night. Varlamov stopped 36 shots and Paul Stastny had a goal and an assist for the Avalanche in a 5-1 victory over the Blackhawks.SOFIA, Bulgaria - Ludogorets scored a late equalizer to hold Liverpool to a 2-2 draw on Wednesday that ended the home sides hopes of reaching the knockout stages of the Champions League.Dani Abalo opened the scoring for Ludogorets in the third minute, pouncing on the rebound after Liverpool goalkeeper Simon Mignolet failed to control Marcelinhos shot from the edge of the box.Rickie Lambert capitalized on a defensive error five minutes later to equalize with a header past keeper Vladislav Stoyanov. Jordan Henderson collected a cross from Raheem Sterling and fired home to put Liverpool in front in the 37th.Ludogorets defender Georgi Terziev nodded the 88th minute equalizer following a corner.Despite only levelling the game late, the home side deserved the point after creating more chances than Liverppool and matching the number of shots on target.ddddddddddddRickie Lambert said that the late equalizer had left Liverpool devastated, adding that the Reds performance is likely enough to silence the teams critics.We showed wonderful resilience and scored two good goals tonight, Liverpool manager Brendan Rogers said. To go a goal behind so early on you really need a team that is together and I think the character of the team came out.We were disappointed with the goal at the end but thats irrelevant.The home side cannot advance, but Liverpool can qualify from Group B by beating Basel in its final match.We need to win a game at the end against Basel and at the start we would have looked at that game as the one to see us through and it should be a great night at Anfield, said Rogers. ' ' '