Novak Djokovic qualified for the last four of the ATP World Tour Finals with a pulsating straight-sets win over Milos Raonic on Tuesday. Having already beaten Dominic Thiem in Sundays opener, the world No 2 was back to his best form at times in a 7-6 (8-6) 7-6 (7-5) triumph at Londons O2 Arena.Djokovic edged a fiercely contested first set in a tie-break and then clinched victory courtesy of another tie-break after both players had dropped serve twice in the second set. Shot of the matchRaonic may be 6ft 5in, but Djokovic beat him with this inch-perfect lob. This lob from Djokovic was the shot of the match Djokovics reactionWinning the first set in a very close tie-breaker gave me some wings and I started playing well. I was two times a break up in the second, but Milos was hanging in there and one or two points separated us today. It could have gone either way. Djokovic speaks to Annabel Croft after the match Expert analysisGreg Rusedski: This is what Djokovic needed. We thought he was back to his best tennis when he was up a set, faltered a little bit, got it back with another break and then found a way to come through. For Raonic, its going to be a sleepless night. These are painful matches to lose when you have the match in your hands on many occasions. Highlights of Novak Djokovic v Milos Raonic from the ATP World Tour Finals Peter Fleming: Raonic had a set point in that second set but failed to convert it, and despite the W next to his name for Novak, there are still a few doubts and a few nerves rattling about in his head - erratic play that will leave him questioning where he is at. But for now he is 2-0 in the round robin and he is going to be around at the weekend. He can still hope his complete game returns. Djokovic explains some of his shot selections at the Sky Pad The matchRaonic made the better start and created three early break points, but he failed to capitalise on each of them after being forced into errors by Djokovics outstanding defensive work and willingness to engage in long rallies.Although Raonic started raining down winners on his first serve, a combination of a weak second serve and more unforced errors allowed Djokovic to keep pace and the set almost inevitably went to a tie break.It went largely with serve until Djokovic broke with a stunning lob and Raonic then double-faulted to hand the Serbian first blood. Raonic hit 42 winners but was undermined by unforced errors Raonic twice looked to be a beaten man when he was broken in the first and fifth games of the second set, but on each occasion he broke back and the match once again went to a tie break.The pair were level at 5-5, but a successful challenge handed Djokovic match point and he took it by forcing Raonic into his 27th unforced error of the tie, a figure that ultimately undermined his total of 42 winners.Watch every day of the ATP World Tour Finals, from November 13-20, live on Sky Sports. Full schedule here. Six months half price Upgrade to Sky Sports now to watch Man Utd v Arsenal this Saturday and get the first six months half Also See: Murrays service syndrome over? As it happened... We will get the dream final Murray: No 1 hasnt changed me Adidas Superstars Clearance Sale . The Oilers come in having lost five in a row (0-4-1) and 16 of their last 20 games, dropping a 2-1 decision to the Vancouver Canucks on Tuesday. 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MOSCOW -- Russia says the International Olympic Committee has dropped an investigation into a deceased wrestler who allegedly tested positive for a banned steroid when an old sample was retested.Besik Kudukhov won the silver medal in the mens freestyle 60-kilogram class at the 2012 Olympics and died the following year in a car crash.The Russian Wrestling Federation says in a statement his sample from the 2012 Games was retested this year and found to be positive for the stteroid turinabol.dddddddddddd. The case was passed to an IOC disciplinary commission, which ended its investigation last week with no action taken, the federation says.The IOC, which has not acknowledged any positive test by Kudukhov, said it was not able to comment on the case. Kudukhov also won bronze at the 2008 Olympics in the 55kg category. 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