Novak Djokovic faces Dominic Thiem at The O2 on Sunday as he begins the defence of his World Tour Finals title and his pursuit to reclaim the world No 1 ranking. Djokovic saw his 122-week hold on top spot ended last weekend when he was usurped by Andy Murray as the worlds top ranked player. World No 1 permutations How the No 1 ranking can change hands...again Having previously admitted that his desire and love for the game had waned, it may be that this latest development adds fuel to the Djokovic fire as he looks to win a sixth World Tour Finals and end the season on top of the standings once again. The 29-year-old has won the season-ending event the last four years and is a two-time Grand Slam champion this year, winning the Australian and French Opens to take his career tally to 14 major titles. Djokovic has endured a frustrating second half of the season and has lost his world No 1 ranking to Andy Murray He also owns a dominant 23-0 record against his three rivals in the Lendl group and first to challenge that will be the youngest man at this weeks finals - Thiem. Ivan Lendl Group Novak Djokovic (Serbia) Milos Raonic (Canada) Gael Monfils (France) Dominic Thiem (Austria) World Tour Finals: Profiles We look back on the year so far for the eight contenders Thiem too has had his struggles over the second half of the year but claimed four titles over the course of the regular season The Austrian is making his debut at the event and after a sensational start to 2016, tailed off over the second half of the year.He has never won a set against Djokovic, losing all three meetings including their most high-profile encounter at the French Open semi-final earlier this year where Djokovic won 6-2 6-1 6-4.In recent weeks the 23-year-old has suffered surprise defeats to Jack Sock, Viktor Troicki and Alexander Zverev and has not gone beyond a quarter-final since the middle of September. Introducing the underdogs What do we know about debutants Dominic Thiem and Gael Monfils However Thiem is not to be underestimated having claimed four titles this year, only Murray (eight) and Djokovic (seven) have won more although the last of those came back in June.Djokovic too has wobbled since his dominant first half of the year - he has been beaten by Marin Cilic and Roberto Bautista Agut since using the US Open final to Stan Wawrinka and he has won just one title since completing his career Grand Sam at Roland Garros and that came with victory at the Rogers Cup in Toronto in July.Whether Thiem can capitalise remains to be seen but the opening singles match of the tournament promises to be an intriguing one. World Tour Finals: The Groups We run through the contenders and their groups at The O2 As is the case for every session the doubles will kick off the action from 12pm on Sky Sports and the first match of the week will see Mike and Bob Bryan taking on Ivan Dodig and Marcelo Melo. Edberg/Jarryd Group Bob Bryan & Mike Bryan Ivan Dodig & Marcelo Melo Jamie Murray & Bruno Soares Treat Huey & Max Mirnyi Bob and Mike Bryan are five-time winners of the season-end doubles event The American brothers are seeded third this year and are four-time champions of the event but come into the tournament on the back of two years without a major title.They face sixth-seeded pair Dodig and Melo who have won the last two Masters events they have entered in Cincinnati and Canada.All the action from the O2 between November 13-20 will be live on Sky Sports across the week and if you are out and about you can follow on our Sky Sports apps and the website via our live blogs. Full schedule here. Live Tennis: ATP World Tour Finals November 13, 2016, 12:00pm Live on Get Sky Sports Get a Sky Sports pass Also See: The Groups Shots to watch Tour Finals at The O2 Panel Predictions Cheap Basketball Shoes Free Shipping . Calgary scored on the first shift, and Michael Cammalleri scored twice as the Flames cruised to a 5-2 win over the Washington Capitals on Saturday. Cheap Nike Basketball Shoes . Anthony Calvillo, through 20 CFL seasons, was frequently invincible and largely stoic in the heat of competition. But underneath the professional exterior he was, and is, compellingly human. http://www.cheapnikeshoesbasketball.com/ . Louis Rams wide receiver Stedman Bailey last Sunday. The fine is the fourth this season for Goldson. He was fined $30,000 for a hit on the New York Jets Jeff Cumberland in Week 1. Nike Basketball Shoes Clearance .com) - Rafael Nadal, Andy Murray and Roger Federer were easy first-round winners Tuesday at the Australian Open. Cheap Nike Basketball Shoes China . -- Ty Montgomery had 290 all-purpose yards and two touchdowns, and fifth-ranked Stanford held on to beat No. Were a full month out from the events of SummerSlam, where Finn Balor experienced the highest of highs in becoming the first WWE Universal champion, then the lowest of lows as he suffered a severe shoulder injury that forced him to relinquish that title the following night on Raw.As Balor continues his rehab and recovery, the timing seemed right to take a closer look at his injury, what he can expect in his recovery, and the biggest concerns he faces on his road back to performing in the WWE.ESPNs greatest resource on injury and recovery questions is undoubtedly Stephania Bell, who spends most of her time writing and commenting on football and baseball. Shes a co-host of the Fantasy Focus podcast with Matthew Berry and Field Yates, and an expert guest on a growing list of other ESPN programs. We jumped at the chance to pick her brain and give her a chance to flex her expertise in the realm of professional wrestling.Its worth noting that the following insights are based on public knowledge, including video footage of the injury at SummerSlam, the list of injuries and complications released by Balor on social media, as well as several images that have made the rounds online in the past month. These insights should be viewed in the context of speaking generally about this type of injury, and an athlete trying to return from it.EXCLUSIVE: See the exact moment @FinnBalor suffered an injury during his @WWE @SummerSlam match against @wwerollins! https://t.co/TSKBZ7qJxS- WWE (@WWE) August 22, 2016Tim Fiorvanti: For an athlete with a small labrum tear in the shoulder, whats the typical length of rehab they can expect to face?Stephania Bell: The majority of small labral tears are associated with a typical dislocation (the most common mechanism is anterior-inferior, where the arm dislocates forward and downward relative to the socket), which would require a few months to return; for most sports the athlete could return within four months, but in the case of elite/pro athletes or higher-risk contact or collision sports, the recovery could take longer.180* labrum tear Thorn bicep and pectoral tendon Cartilage damage & Fracture to the glenoid neck socket (I have it in a jar on my dresser)- Finn Bálor (@FinnBalor) August 28, 2016Fiorvanti: As opposed to a smaller or more straightforward tear, which you just described, what happens in a 180 degree labrum tear (like the one suffered by Balor)? How much more work/how different is the work that has to be done by the doctor in making the repair? How does that affect the rehab going forward?Bell: A 180 degree tear is basically a larger tear. If you consider the socket, also called the glenoid (its the round portion on the side of the scapula or shoulder blade where the arm bone [humerus] sits). With a surface thats approximately 360 degrees, a 180 tear runs along roughly half of the glenoid. From the surgeons perspective, it requires more anchors to fix; in the majority of smaller labral tears, it may take three or four anchors to do the repair. For a 180, it could be more along the lines of five to seven anchors.Each additional anchor extends the surgery time by a few minutes, and given the increased size of the injury and subsequent repair, the athletes movement is more restricted -- especially in the early phases of recovery, in order to protect the repair. While the time for the actual tissue to heal is about the same, the process of regaining motionn, strength and returning to function takes longer.dddddddddddd. The total recovery for most athletes is likely to be at least 6 months.Fiorvanti: How is there such extensive damage that all happened from this one bad landing? What does it all mean when you assess the severity of his injury and his recovery time?Bell:?This is considered a high-energy injury. In other words, a lot of force is going through the shoulder at a high rate of speed -- exceeding what the structure can handle. The more force applied, the more damage youll have to structures beyond the labrum and superficial soft tissue.Think of a motor vehicle accident as an analogy. At a slow rate of speed, there are lower forces involved in a collision and theres likely to be less structural damage to a vehicle. The bumper might have some damage, but maybe nothing else. In a high-energy collision, the forces involved are greater and the resultant damage is greater, too. Not only is the bumper taken out, but the structural integrity of the vehicle might be compromised in multiple ways.Fiorvanti:?Is it possible that some of the damage could have come from him resetting his shoulder after he dislocated it?Bell:?Its not likely in this case. The damage was probably so significant that relocating his shoulder didnt matter to the end result.Fiorvanti:?What kind of timetable can we expect Balor to be on? Does the figure released by the WWE mesh with actual expectations for an injury like this?Bell:?The timetable remains very fluid depending on the individual. Theres a sliding scale of when new activities are added, based on how the tissue appears to be healing and how the athlete is feeling.Fiorvanti:?Immediately after his surgery, Balor was pictured wearing a large apparatus to stabilize his shoulder. Talk to me about its purpose and its function in helping the healing process.Bell:?The brace is called an ultra sling. It positions his arm in a supportive position, while minimizing stress on the surgically repaired tissue. Essentially, its placing the shoulder in the optimal position for healing to occur by minimizing pressure within the joint to protect the cartilage. It also keeps him from rupturing the tendon in the front of the shoulder, which had to be detached at the start of the surgical procedure so that the doctor could access the injured portion of his shoulder. That tendon also had to be repaired once the rest of the procedure had been completed.Fiorvanti:?Considering the type of physicality he engages in when performing in the WWE, what are your biggest concerns about his long-term health and risk of re-injury?Bell:?The key here is that the injury was able to be repaired. The stability should be reinforced by the surgery and Balor should be able to regain full range of motion and strength (which also helps his overall shoulder stability going forward). If he does, in fact, regain his motion and strength, he should have no limitations in returning to competition.Naturally, any time you have a serious injury there may be some changes to the joint surfaces, along with the presence of scar tissue that would not otherwise have been there. Its hard to say that he is definitively at any greater risk of re-injury, especially if he fully rehabs and is at full strength prior to his return to the ring. 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