Former British No 1 Greg Rusedski says Andy Murrays crunch game against Kei Nishikori on Wednesday will be huge, but believes he will come through it and we will see the dream final.The Wimbledon champion was tested for much of his opening match at the ATP World Tour Finals but still came out on top, beating Marin Cilic 6-3 6-2 at Londons O2 Arena.Murray took over at the top of the rankings last week, replacing Novak Djokovic, but the year-end No 1 ranking is still up for grabs and could be decided on Sunday if both Murray and Djokovic reach the final. Watch NOW TV Watch Sky Sports for just £6.99. No contract. And Sky Sports Tennis expert Rusedski is sure the British public will get to see the two best players on the planet battle it out on Sunday, although Peter Fleming feels we shouldnt get ahead of ourselves. I thought [Murray] played great today. He got off to a nervous start and had a few break break points against him early on, but held those and then came through the first set, said Rusedski. Murray wins on debut as No 1 Andy Murray beats Marin Cilic in ATP World Tour Finals opener Again, Cilic lifted his game early on in the second set and then Murray went on from strength to strength so a great start to these championships.Fleming said: It was most certainly tough for him. He started off very slowly and certainly appeared to be nervous, as did Cilic. But thankfully for Cilic, Murray never quite got it going. He won the first set and then rolled him in the end. Mark Petchey invites Murray to guess a shot during his win against Cilic Although Rusedski thinks Nishikori will be a tough opponent for him, he does feel the top seed will come through the encounter with the crowd right behind him again.Nishikori will be tough for him - he lost to him at the US Open where Murray had a good chance to beat him, but lost in five sets, he said. I just feel like Murray, the number one, playing the big points better, full of confidence and the reception he got was unbelievable.Hes got more time on the return of serve. Hes going to be able to be more aggressive than Stan The Man was and I think hes going to find a way to get through and top this group. Reaction from Cilic and Murray as the world No 1 wins his first match at the ATP World Tour Finals Murray said the court surface slowed up due to the full capacity at the O2 Arena causing more humidity in the air during his post-match interview, but Fleming doesnt think it is a factor.I dont think the court surface is a big deal to be honest with you, he said, All the players here move very well and enjoy this court surface. As Andy said tonight, the court was slower with all the people in it. Might have been more humid, but I dont think its a big factor - its about who brings it on the day. Murray explains his match tactics to Mark Petchey after he beat Cilic in his first game on home soil after he was crowned world No 1 And looking ahead to Wednesdays match against the Japanese star, Rusedski said: Wednesday is huge for him against Nishikori, but I think he will top his group and we will get the dream final - Djokovic and Murray for the world number one.But Fleming wasnt looking too far ahead, adding: The Nishikori match is as close to a 50-50 match as were going to have this week, so first things first.Check our game-by-game coverage from all group matches at the ATP World Tour Finals in London - including Andy Murray - 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!Also See:Murray wins on debut as No 1Special Kei makes perfect startWawrinka: Injury not to blameTour Finals: Panel predictionsMuggsy Bogues Jersey . 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The Lightning are 2-0 so far on a four-game road trip, giving the club five straight wins as the guest and improving Tampas away record this season to 11-8-2.WASHINGTON -- Bryce Harper is out of the Washington Nationals starting lineup for the third straight game because of an injured left thumb.With rain forecast, Nationals manager Dusty Baker did not want to risk the NL MVP in a wet outfield during Wednesday nights game against Arizona.Nationals catcher Wilson Ramos tore his right anterior cruciate ligament Monday after a rain delay. Ramos landed awkwardly after catching a relay throw at home plate.With the rain, youd hate for his thumb to feel OK and then he getts hurt doing something else, Baker said.dddddddddddd We already had that once already. Not that someone else is a sacrificial lamb, but since hes already injured, it would be better not to take a chance.Harper is batting .244 with 24 home runs and 95 RBI this season.Second baseman Daniel Murphy has not been in the starting lineup since Sept. 20 because of a strained left buttocks. ' ' '