Stan Wawrinka kept his hopes of a semi-final berth alive with a straight-sets victory over Marin Cilic at the ATP World Tour Finals on Wednesday night. The Swiss superstar helped his chances of finishing the year ranked third and of reaching a fourth-straight semi-final at the O2 with a 7-6 (7-3) 7-6 (7-3) victory. Six months half price Upgrade to Sky Sports to watch Man Utd v Arsenal on Saturday and get the first six months half price Cilic was beaten in straight sets by Andy Murray in his John McEnroe Group opener while Wawrinka lost to Kei Nishikori, meaning whoever lost their second match would almost certainly be heading home. The win helped US Open champion Wawrinka extend his head-to-head lead to 11-2, having now won his last seven matches against Cilic, who is out. Did you know... The last time a player lost his opening match and went on to win the title was in 2009 when Nikolay Davydenko surprised everyone to win at Londons O2 Arena. Shots of the matchWawrinka showed he is not just all about power as he lured Cilic into the net before showing a delicious touch to lob him. Wawrinka showed that hes not all about power with this delicate lob... But when it does come to pure power, Wawrinka can produce it when it most matters - especially on the backhand side. But the Swiss star does possess an awful lot of power on that missile of a backhand... Expert analysisGreg Rusedski: Hes back in business. He played great tonight. Cilic played him into form. Hes very confident going up against Marin because Marin isnt willing to come forward which allowed him to hit many groundstrokes and get a feeling for the ball. By the end of it, he was playing lights out tennis. Its not what Andy Murray wanted to see, an in-form Wawrinka on Friday.Peter Fleming: This match seemed to turn his game around. He was hitting the ball well and hes not going to be an easy guy to put out. Wawrinka joins Leif Shiras at the SkyPad to examine his victory over Cilic The matchThere was very little to choose between the two players, who both packed a punch with some blistering winners. Cilic had made very few inroads into Wawrinkas serve until he earned a set point at 5-4. However, the Swiss star quickly shut the door with a brave 100mph second serve into the body. The Wawrinka backhand was at its blistering best in the second set Quite predictably, it headed into a tiebreak, and it was the third seed who started forcing the errors from Cilics racket, which was enough to take the set.Just when it looked as though Wawrinka had the momentum, Cilic struck in the opening game of the second set. Wawrinka was happy to get his first victory in London after defeating Cilic Despite being hampered by a knee injury recently, the 31-year-old is determined to finish his season on a high, and responded with some fearsome hitting of his own to level in the fourth game.It was enough to send the tight contest into another tiebreaker. And Wawrinka struck a huge blow with an unstoppable 98mph forehand for the mini-break which he never relinquished to set up a mouth-watering clash against Murray. Heres the moment Wawrinka beat Cilic in straight sets Following his loss to Murray and now Wawrinka, Cilic is 0-5 at the ATP World Tour Finals.Check our game-by-game coverage from all group matches at the ATP World Tour Finals in London - including Andy Murray v Stan Wawrinka on Friday - on skysports.com/tennis, our app for mobile devices and iPad and our Twitter account @skysportstennis.Upgrade to Sky Sports now to watch Man Utd v Arsenal this Saturday and get the first six months half price! 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Greig Laidlaw slotted 16 points for Gloucester as they got their first win of the Aviva Premiership season thanks to a 26-13 triumph at Sale Sharks on Friday evening.The visitors controlled the initial stages of the match and went 7-0 in front via John Afoas converted try, but Sale hit back as Sam James crossed the whitewash.Laidlaw and Will Addison then traded penalties before the Kingsholm-based side touched down for the second time through Charlie Sharples.Cameron Neild reduced the arrears in the second half, but successive Laidlaw three-pointers gave the visitors an excellent win. For a squad intent on breaking into the top-four, the West Country outfits first two games ultimately ended in frustration.Their comeback against Worcester, where they recovered from 20-9 down to draw 23-23, displayed impressive resolve but, having lost to Leicester on the opening day, that result still represented a disappointment.The Cherry and Whites inauspicious start to the campaign could have spilled over to this encounter with Sale but memories were evidently fresh from their last domestic victory.That was achieved in Manchester when they inflicted the Sharks only home domestic defeat of 2015-16 following a 12-11 triumph. With that in mind, the visitors opened brightly and deservedly went into the lead.Sharples burst down the right-hand side put the hosts rearguard under pressure before Billy Burns spotted a gap and off-loaded to prop Afoa, whose wing-like support line enabled him to cross the whitewash.ddddddddddddaidlaw converted as Gloucester moved 7-0 ahead, but Sale soon began to find some continuity. For the first time in the match, Steve Diamonds men managed to string together a number of phases and good hands down the blindside sent James over.After that unconverted try, the home side proceeded to dominate, creating several chances inside the opposition 22, but Gloucesters defence remained resilient.A penalty apiece for Addison and Laidlaw took the score to 10-8 in Gloucesters favour before David Humphreys team were rewarded for their endeavour late in the half.They inflicted a crucial blow just shy of the interval and once again it was Sharples who came to the fore. His off-load to Ben Morgan started the move and the wing then had the wherewithal to get back on his feet and be on the end of Tom Marshalls deft grubber.Needing a response, the Sharks, who had won one of their two encounters going into this contest, controlled the early passages of the second period. Gloucester held on commendably but eventually their tryline was breached when a driving maul resulted in Neild going over.Humphreys men were now struggling to get out of their own half but a needless Sale infringement gave Laidlaw an opportunity to extend their buffer, one which the skipper duly converted. A further two three-pointers from the scrum-half sealed the victory. ' ' '