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GLASGOW, Scotland -- Juan Martin del Potro ended Andy Murrays 14-match winning streak in the Davis Cup, coming through a grueling five-setter to give Argentina a 1-0 lead over titleholder Britain in the semifinals on Friday.Del Potro won 6-4, 5-7, 6-7 (5), 6-3, 6-4 in 5 hours, 7 minutes to gain a measure of revenge after losing the Olympic final to Murray in Rio de Janeiro last month.Being taken the distance was exactly what Murray didnt need at the end of his long summer of tennis in which he won both the Wimbledon and Olympic titles for the second time. He looked almost out on his feet at times in an energy-sapping final set, and couldnt handle the barrage of forehand shots by the rejuvenated Del Potro.Del Potro gained the crucial break in the fifth set at the third opportunity, reaching Murrays volley with a forehand winner down the line to go 4-3 ahead, and he served out for the match, clinching victory with an ace and a big growl.Murray had never previously lost a home singles match in the Davis Cup.Argentina is playing its 11th Davis Cup semifinal in 15 years. The south American country has never won the team event, finishing runner-up in 1981, 2006, 2008, and 2011.Del Potro, the 2009 US Open champion, is a force in tennis once again after returning from three wrist operations that nearly ruined his career. He is Argentinas top player but is ranked a lowly No. 64 on his comeback trail, meaning he had to play Murray in the opening match.I cannot imagine this moment in my career, Del Potro said. This was the type of match I was missing when I was at home.Kyle Edmund takes on Guido Pella in the second singles later Friday. On Saturday, Murray is scheduled to partner his brother, Jamie, in the doubles against Federico Delbonis and Leonardo Mayer.Nike Shoes Black Friday Sale . Self was acquired from the Buffalo Bandits in a trade for Alex Hill midway through last season, and made his debut in Rochester on March 16, 2013. Nike Shoes Black Friday Discount ., and Rudi Swiegers of Kipling, Sask., took sixth spot on Saturday in pairs at the NHK Trophy ISU Grand Prix figure skating competition. http://www.nikeshoesblackfriday.com/ .S. Open champion Justin Rose birdied the first hole with a blind shot he hit to a foot of the pin, and he stayed in front Tuesday until he completed a 4-under 67 for a two-shot lead over Jason Dufner in PGA Grand Slam of Golf. Nike Shoes Black Friday China . Burke is expected to miss two to three months after breaking a finger in the teams third preseason game. Tinsley, a 10-year veteran, spent the last two seasons in Utah, where the point guard averaged 3. Fake Nike Shoes Black Friday . "I dont know that were close," said general manager Alex Anthopoulos. "I just think, right now, the acquisition cost just doesnt work for us right now. I dont know if I can quantify how far off or things like that that they might be but I would say we continue to have dialogue.Andy Murray will be required to conjure up more of his remarkable powers of recovery if he is to make it through to the semi-finals of the ATP World Tour Finals on Friday.Having beaten Marin Cilic and Kei Nishikori, the world No 1 only needs to win a set against Stan Wawrinka to guarantee his passage through to the semi-finals at the O2 Arena for the first time since 2012. Six months half price Upgrade to Sky Sports to watch Man Utd v Arsenal on Saturday and get the first six months half price But he will have to drag his weary body through another tough test as an explosive season finale draws ever closer. World No 3 Wawrinka showed much better form in beating Cilic on Wednesday than he had in his limp loss to Nishikori and the Swiss knows that a straight-sets win over Murray would maintain his record of always reaching the last four. Sky Live: Murray v Wawrinka Andy Murray takes on Stan Wawrinka at ATP World Tour Finals Nothing comes easy against the very best players in the world, let alone against the US Open champion who has suddenly clicked in London - something Sky Sports analyst Mark Petchey acknowledges.Wawrinka is always the wildcard in the pack, hes the guy that when hes confident, hes got the power to get through tough surfaces and he does a lot of things well, said Petchey. He moves better than people give him credit for and as I say it was an intelligent performance with the use of the slice. Its not just about the power and the showbiz tennis. Wawrinka beat Murray at the Tour Finals in London last year Friday will be the 17th meeting between the pair, with Murray leading the head-to-head record 9-7, and when they do clash, sparks usually fly.Wawrinka, who sealed his first major title at the 2014 Australian Open before winning an ATP Tour 500 and 1000 event, last faced the Scot in the French Open semi-finals.That was one of Murrays most impressive performances of the season and ended a run of three straight losses to Wawrinka, including at the O2 last year with qualification at stake. Murray also suffered a 6-1 6-2 defeat to Wawrinka at the Monte Carlo Masters in 2013 Wawrinka, who faces a battle to hold on to the world No 3 ranking, said: All I know is, if I want to have a chance to qualify, I need to win.dddddddddddd Thats all Im trying to do.Im going to try to play my best tennis, to beat the world No 1. Its going to be a tough match. We played each other many times. The hardcourt surface at the O2 Arena will suit Wawrinkas heavy hitting style of game from both flanks, but hell have a job breaking down a resilient Murray. The 29-year-old is a totally different prospect to the one he faced in the US Open quarter-finals and Monte Carlo Masters in 2013.Arguably the most famous meeting between the two came under the Wimbledon lights in 2009 in a contest lasting three minutes short of four hours, which the Scot won in dramatic fashion. Could it more of the same on Friday? Mark Petchey and Greg Rusedski discuss Murray’s epic win over Nishikori and his chances against Wawrinka Obviously its going to be a tough match, said Petchey. Theyve had a lot of tough matches in the past and this will be another one.Andy is the form player right now and Im sure inside hes feeling pretty invincible every match he steps out on court. WATCH: Murrays double take Andy Murrays remarkable winner against Kei Nishikori was reminiscent of his winner in Rome Weve got a couple of guys out here who are Grand Slam champions who both believe they can win every single match they step out on court with, no matter who theyre playing, where theyre playing in the world, on what surface theyre playing in the world.So both of those players are going to go into that clash on Friday believing and knowing at the moment they still need to win it. Murrays service syndrome over? Andy Murrays service syndrome may be a thing of the past Should Murray win his group, he would play Milos Raonic in the semi-finals on Saturday in a repeat of their Wimbledon final and Australian Open semi-final. Let battle commence...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 afternoon - 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 beats Nishikori in epicWATCH: Murrays double takeOne of the best matches everWawrinka keeps hopes alive ' ' '