Sky Bet's Tim Clement previews the ATP World Tour Finals and offers up his top tips

Novak Djokovic is expected to continue his winning run as the ATP World Tour comes to a climax with the top eight clashing in the finals in London.

The contenders (and Sky Bet odds) Novak Djokovic (6/5) As aforementioned, Djokovic will be looking to defend his title and reassert himself as the top force in men's tennis. If Nadal toils and the No 1 spot is up for grabs, it would take a brave punter to oppose the Serb taking his chance. Motivation will hardly be a problem either way, while fatigue should not be a major concern with the 26-year-old looking fit and focused in Paris. A gruelling final encounter with Ferrer will not aid his chances of prevail from a very tough group, but if any player has the reserves to cope with the schedule then it is the reigning champion. Rafael Nadal (9/4) The 13-time Grand Slam winner will be looking to land his first ever title at the season-ending championships. Just one of his 60 career titles have come from indoor hard-court events, although it is worth taking into account that the Spaniard rarely enters them given the environment serves against his typically patient play. However, his resurgence from injury has seen a more aggressive, powerful style of play, suggesting that he is better placed to compete this year. While the ultra-competitive nature of the man means he certainly cannot be accused of giving less than 100 per cent in Paris, the motivation perhaps was not quite a strong as it will be here. A couple of wins will be enough to see him finish the season as number one while the maiden title would be the dream way to cap a stunning campaign, which has already seen him capture 10 titles. Roger Federer (13/2) It seems strange to be monitoring gradual improvements in the game of the sport's most successful ever player, but that is the case with Federer. A steady incline has been evident over the last couple of months, with his display in Paris the best seen since the Australian Open. He managed to avenge his defeat to del Potro in Basel with a win in Paris, where he then led Djokovic by a set and a break. That loss could prove a blessing in disguise as he gets an extra day's rest before they meet on Tuesday but the psychological edge will certainly be with the favourite. Confidence can certainly be drawn from six titles at the season-ending event, while he boasts the best indoors record of the currently active players on tour. Juan Martin del Potro (7/1) The powerful Argentinian has recorded a joint career best four titles in 2013 but it would be a major step up for him to make it five. The 2009 US Open triumph is his solitary success above a 500 event level, pointing to vulnerability against the top players at the business end of tournaments. Given his powerful, low-percentage game, it is no surprise that much of his success has been indoors, with five of his last eight titles coming in the environment. A final appearance in the 2009 World Tour Finals adds weight to his case, but a wretched draw has not helped his chances. The rest Ferrer (22/1) has once again defied the label of a clay-court specialist with his display in Paris but it has been a relatively disappointing campaign since his French Open final appearance, with defeats to six different players outside the top 20. With his typically consistent standards dropping somewhat, it would be a significant shock if he were to upset the favourites, not to mention a phenomenal physical effort. The form of Berdych (20/1) is even more concerning, with early loses in Shanghai and Basel followed by a defeat to Ferrer in Paris, an environment the powerful Czech should surely fancy himself to prevail. Stanislas Wawrinka (25/1) has shown on various occasions this season that he can put together the form to trouble those above him but tends to struggle in turning big performances into big results. Gasquet (50/1) is the big outsider having offered up little of note since his US Open semi-final run. Best bets Djokovic to win the title - 6/5 Djokovic to beat Federer in the final - 10/1

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