Novak Djokovic continues his quest to regain the world No 1 ranking with a World Tour Finals semi-final showdown against Kei Nishikori. The Serb saw his 122-week grasp at the top of the rankings ended by Andy Murray in Paris almost a fortnight ago, but he can reclaim the position depending on the outcome this week.First he must overcome Japans Nishikori and with a dominant 10-2 record in the head to head he will start Saturdays semi-final in confident fashion, especially after a week that has seen him return to somewhere close to top form. Novak Djokovic and Kei Nishikori have met in two finals this year - on Saturday they meet for a place in the World Tour Finals showpiece Djokovic lost his opening set of the week to Dominic Thiem last Sunday but recovered to win the match in three sets and followed up with another pair of victories over Milos Raonic and alternate David Goffin,He had to come through an epic content against Raonic, eventually prevailing 7-6 7-6 while he had little trouble against late replacement Goffin who was dispatched 6-1 6-2.Nishikoris last four place had already been assured after Murrays straight sets win over Stan Wawrinka earlier in the day. Having begun the week with a superb victory over Wawrinka, Nishikori lost his next two matches.Having pushed Andy Murray close in his second match before losing in three sets, he ended the group stages with another three-set defeat, losing to Marin Cilic in three sets on Friday night. World Tour Finals - Story So Far Novak Djokovic Kei Nishikori beat Dominic Thiem 6-7 6-0 6-2 beat Stan Wawrinka 6-2 6-3 beat Milos Raonic 7-6 7-6 lost Andy Murray 7-6 4-6 4-6 beat David Goffin 6-1 6-2 lost Marin Cilic 6-4 2-6 3-6 John McEnroe talks about the price of ending the year as the world No 1 While world No 5 Nishikori has been in fantastic form this season, reaching his second and third Masters finals as well as his second Grand Slam semi-final, he will have to overcome a run of form against Djokovic that has seen him lose his last nine matches against the Serb.Djokovic has won all five of their meetings this year, including victory in both the Canada and Miami Masters finals, while Nishikori has won just three sets in their contests since his last win, a memorable US Open semi-final success in 2014. Kei Nishikori has come as close as anyone to beating Andy Murray this week, losing in three sets in the group stage The pair have twice met at the O2, Djokovic winning in the group stage in both 2014 and last year where he was a 6-1 6-1 victor.The signs are ominous for Nishikori but the 26-year-old appears to be relishing the challenge against the very best these days and a win would see him beat his semi-final performance of his World Tour Finals debut a couple of years ago. Djokovic v Nishikori met in the Miami final earlier this year Djokovic v Nishikori met in the Miami final earlier this year As ever it will be a doubles match which kicks off the evening and after confirmation of their world No 1 ranking, Jamie Murray and Bruno Soares will hope to book a final place when they face Rajeev Ram and Raven Klaasen.Murrays position as the year-end No 1 was confirmed when the French pairing of Nicolas Mahut and Pierre-Hugues Hubert lost their third group game of the week on Friday.Murray and Soares claimed the Australian and US Open titles and have won two of the three matches the pair have played.Follow all the action from the O2 on Saturday when the action begins on Sky Sports 3 from 12pm and 4pm or via our live blog here at www.skysports.com/tennis. Also See: World No 1 permutations Djokovic hammers Goffin Parris Campbell Jersey . 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Two seeds fell: No. 4 Kirsten Flipkens of Belgium lost to Katarzyna Piter of Poland 6-4, 6-2, and No. Marshall Faulk Womens Jersey . Arsenal had already scored its goals in the third round fixture when the fierce rivalry turned ugly in the final ten minutes as Walcott was being carried off on a stretcher. FRISCO, Texas -- FC Dallas coach Schellas Hyndman said he expects the rest of his teams matches to be tough. Saturday was no exception. Michels scored on a penalty kick in the 72nd minute to help FC Dallas salvage a 2-2 draw against the San Jose Earthquakes and take sole possession of the final playoff spot in the Western Conference. Three red cards in the final 10 minutes also made the match entertaining one, as both teams were keen on earning three points for the final playoff push. "I think that the games are going to get a lot more physical," said Hydnman, whose team snapped an 11-game winless streak Wednesday after tumbling down the table. "I think the games are going to get a little bit more competitive. " Blas Perez also scored for Dallas (9-7-10), which rallied after giving up two goals in the first 16 minutes. Dallas moved into fifth place in the Western Conference, one point ahead of Vancouver. Alan Gordon and Steven Beitashour had the early goals for San Jose (9-10-7), which had won four of its previous five matches. Gordon, making his 100th MLS start of his career, sent home a shot from the centre of the box in the eighth minute after Cato squared the ball to the middle. Eight minutes later, a series of volleys from Gordon and Rafael Baca found defender Beitashour all alone six yards out to pop the ball over the right shoulder of goalkeeper Raul Fernandez. Dallas quickly responded in the 19th minute when Michel served a ball toward the box, which midfielder Je-Vaughn Watson nodded on toward the 6-yard box. Perez won a short race to the ball against goalkeeper Jon Busch to tap the ball into the net with his right foot for his 10th goal of the season.dddddddddddd Michel then tied in the second half when he put his left-footed penalty into the upper-left corner. Perez was fouled by Victor Bernardez six yards away from goal to earn the spot kick after defender George John found Perez on a far-post cross to set up the play. "Instead of folding, you fought all the way back and you could have very well won the game," Hyndman said. "I thought we had a very good game outside of the first 15 minutes." Dallas outshot San Jose 17-7, taking all momentum after Michels penalty kick. San Joses Justin Morrow, who entered the game in the 66th minute as a substitute, was given a red card on a tackle from behind on Ramon Nunez in the 81st minute. Four minutes later, both Dallas Kenny Cooper and Bernardez were shown red cards after the Bernardez fouled Cooper, and Cooper retaliated with a shove to the ground and an intimidating hold to the defenders jersey. Cooper and Bernardez have some history. The San Jose defender pushed Cooper out of bounds May 25 in the teams first contest the season, leading to a concussion for Cooper. "Of course were fighting (for a playoff spot)," San Jose defender Clarence Goodson said. "It was a very interesting game." San Jose midfielder Cordell Cato put a shot on target in stoppage time that was tipped over the net by Fernandez. Dallas defender Kellyn Acosta said this game was the most physical he has been a part of. "Their guys are huge )all of them," Acosta said. "They play more of a direct game. They play long balls, so that was a challenge for me." Dallas outshot San Jose 9-3 in the second half. ' ' '