Novak Djokovic heads into the Paris Masters with his No 1 ranking under serious threat from Andy Murray, and in the rare position of being second favourite.On current form Murray has the edge after collecting a third straight tournament win after victory at the Erste Bank Open in Vienna, his career-high seventh title of the year.The second-ranked Scot has spent 76 weeks as world No 2 but can overtake Djokovic if he wins the title and the Serb doesnt reach the final. But Djokovic has form in the French capital and will be looking to win the tournament for the fourth straight year and fifth time overall, despite his recent erratic form. Super Murray wins in Vienna Andy Murray beats Jo-Wilfried Tsonga to win Erste Bank Open in Vienna Watch NOW TV Watch Sky Sports for just £6.99. No contract Youve got to give [Murray] credit for what hes done in the last three or four months, the second part of the year is quite incredible, Djokovic said. Hes playing maybe the best tennis hes ever played, very consistent, very strong. He definitely deserves to be in the position of being No 1 at the end of the year. But that doesnt just depend on him.Djokovic, who crushed Murray 6-2 6-4 in the final last year, will keep top spot if he reaches the final, and Murray is not overly optimistic of knocking him off his perch. Highlights of Andy Murray v Jo-Wilfried Tsonga from the Vienna Open final Obviously he could win the event and, if I lose in the first round, then I am a long way from being No 1, said Murray, who trails Djokovic 24-10 in career matches. Ive never won [the Paris Masters] before, so to just expect that youre going to win the tournament would be silly.In some other years, a year like this would easily [have] been enough to be No 1 in the world, Murray said. But I am obviously getting closer. Highlights of Murray v Roberto Bautista Agut in the final of the Shanghai Masters Murray, who has a first-round bye, will start his tournament against Fernando Verdasco or Feliciano Lopez.He could then face Lucas Pouille, then Roberto Bautista Agut or Tomas Berdych, before a mouth-watering semi-final date against Milos Raonic - who is still feeling the effects of ankle injury - or Basel runner-up Kei Nishikori. Highlights of Djokovic v Kei Nishikori from the final of the Toronto Masters Like Murray, Djokovic also has seven titles this year, matching his tally from 2013 and 2014, but will fall short of the 11 he won in an utterly dominant 2015.The last couple of months were not easy, Djokovic said. Mentally I just had to redefine my goals, things that are happening on and off the court.But now I feel great and rejuvenated, very happy to be back in the city where I have wonderful memories. It gives me a lot of emotions and butterflies in my stomach when I think about the last time I was here. Highlights of the clash between Murray and Grigor Dimitrov from the final of the China Open Djokovic, who also won here in 2009, faces either Nicolas Almagro of Spain or Gilles Muller of Luxembourg in the second round.He could then face Grigor Dimitrov, then ATP World Tour Final-chasing Marin Cilic, before a blockbuster of a semi-final clash against Stan Wawrinka in a repeat of their classic US Open final encounter earlier this year. Check our game-by-game updates from all of Andy Murrays matches at next weeks ATP Paris Masters on skysports.com/tennis, our app for mobile devices and iPad and our Twitter account @skysportstennis, live on Sky Sports.Also See:Super Murray wins in ViennaAndy must keep Novak in sightTennis on SkyDjokovic mentally ready for ParisTrey Johnson Jersey .com) - Richie Incognito has reportedly been admitted to a psychiatric care unit in Arizona. 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SIMONS ISLAND, Ga.NEW YORK -- Juan Martin del Potro is the lowest-ranked man to reach the U.S. Open quarterfinals since Jimmy Connors in 1991, and it turns out a 27-year-old Argentine can share much in common with a 39-year-old American.At its root, the story captivating fans at Flushing Meadows is the same: the former champion making an unlikely run to reclaim past glory.In del Potros case, his body has betrayed him through injuries, not age -- multiple left wrist surgeries that kept him from the majors for 2+ years. The only thing missing from his tale so far at this tournament is a marathon match.Mondays victory was particularly brief after eighth-seeded Dominic Thiem retired in the second set because of a bum knee. For once, an injury was aiding del Potro, not hindering him.Still tired after the stunning run to an Olympic silver medal that announced him as a contender again, he got a huge break in spending only 72 minutes on court. Del Potro has played just 10-plus sets through four rounds and got in some extra hitting after Mondays match abruptly ended.Thiem took a medical timeout to have trainers look at his right knee after the second sets fifth game. He returned to the court for one point before deciding he couldnt go on.Del Potro had won the first set 6-3 and was up a break in the second. He had trainers massage his right shoulder on a few occasions but looked fine after coming back from down an early break.Thiem said his knee started hurting three days earlier, and he speculated it was the indirect result of blisters on his feet -- he needed to alter his gait to compensate. Late in the first set Monday, it started getting worse. He didnt want to take any risks with a knee injury and planned to get an MRI.I couldnt bend it too much the last three days, he said. So I was all the time a little bit handicapped.Thiem, who turned 23 on Saturday, has had a breakthrough year, reaching the French Open semifinals and cracking the top 10. But all those victories came with a cost -- a tour-high 69 matcches, and the long season had started to wear on his body.dddddddddddd On top of that, he had played 12 sets through three rounds at the U.S. Open.I never expected to play that many matches, of course, this year, he said. For sure next year Im going to change it up a little bit.Del Potros quarterfinal opponent will be third-seeded Stan Wawrinka, who has already made a cameo in this saga. In del Potros first Grand Slam back, his second-round upset of Wawrinka at Wimbledon initially hinted at a return to the top of the sport.He will be the favorite to win in that match, del Potro insisted, before adding: But anything can happen in this event for me. I got the power from the crowd in every match.In Wawrinkas victory Monday, the two-time major champ blew a lead, smashed a racket and eventually pulled it out in four sets against 63rd-ranked Illya Marchenko, who was playing in his first Grand Slam round of 16. The other mens quarterfinal Wednesday will be second-seeded Andy Murray against No. 6 Kei Nishikori after both posted commanding straight-set wins.On the 25th anniversary of the 174th-ranked Connors rousing run to the semis, del Potro, at No. 142 in the world, is a win away from that stage. Hes already in his first major quarterfinal since 2013 Wimbledon.Del Potro recalled in his on-court interview after Mondays match how sad he was to watch the U.S. Open on TV, stuck at home the last two years.I didnt expect to be in quarters in my second Grand Slam after my comeback, he said later. Im playing good tennis. My level is growing up every day.Somebody noted that at the 2009 U.S. Open, which ended with a victory over Roger Federer in the final, he beat an Argentine, an Austrian and a Spaniard along the way -- just as hes done this year.Del Potro burst into laughter and replied: I only remember the finals against Roger, and hes not here. But its a good point. ' ' '