Postpublished at 16:20 British Summer Time 16 September 2016
Murray 4-6 7-5 4-5 Del Potro*
John Inverdale
BBC commentator in Glasgow
That is ridiculous. Amazing from Murray.
Davis Cup semi-final day one: GB 0-2 Argentina
Juan Martin del Potro (Arg) beats Andy Murray 6-4 5-7 6-7 (5-7) 6-3 6-4
Guido Pella (Arg) beats Kyle Edmund (GB) 6-7 (5-7) 6-4 6-3 6-2
Sunday, 13:45 BST: Live coverage on BBC One, 5 live sports extra & online
Mike Henson and Matthew Henry
Murray 4-6 7-5 4-5 Del Potro*
John Inverdale
BBC commentator in Glasgow
That is ridiculous. Amazing from Murray.
*Murray 4-6 7-5 5-5 Del Potro
What a game.
What a match.
What a player.
Andy Murray comes through an epic tussle to keep the third set alive. The Emirates Arena is breaching decibel limits left, right and centre.
Murray 4-6 7-5 4-5 Del Potro*
John Lloyd
Former GB Davis Cup captain on BBC Two
I cannot believe it.
Murray 4-6 7-5 4-5 Del Potro*
Juan Martin del Potro with set point. Into the net he comes.
Andy Murray with a dipping cross-court volley up, up, down, down and...IN!
Murray 4-6 7-5 4-5 Del Potro*
Andy Murray nets as he thumps for glory down the line. One gone.
Juan Martin del Potro blasts down another comet of a serve. A second gone.
Murray 4-6 7-5 4-5 Del Potro*
John Lloyd
Former GB Davis Cup captain on BBC Two
What was that?
It was probably the worst shot Murray has ever hit in his career.
Murray 4-6 7-5 4-5 Del Potro*
Andy Murray with a horrible framed forehand volley that wobbles in past puzzled Juan Martin del Potro for 15-15.
A long exchange from the baseline, trench warfare, and finally it is Juan Martin del Potro who blinks, bopping a backhand long. 15-30.
Andy Murray pings a vicious forehand onto Delpo's toes. 15-40.
Two break points.
Murray 4-6 7-5 4-5 Del Potro*
John Lloyd
Former GB Davis Cup captain on BBC Two
This is a game as a spectator I love.
This is what the game is all about. I think it is a 50-50 game and I can't wait for it to start.
Murray 4-6 7-5 4-5 Del Potro*
Andy Murray comes off his stool bristling with injustice.
He rattles through a love service hold to swing the service spotlight back onto Juan Martin del Potro.
*Murray 4-6 7-5 3-5 Del Potro
The game ends in farce. Andy Murray stops playing on a Juan Martin del Potro serve, convinced that the ball has clipped the top of the net and it should be a let.
The let machine failed to register it was such though.
Murray says that everyone could hear it and that umpire Pascal Maria should play a let anyway.
"Computer says no," says Maria (or words to that effect).
"Why don't we just start the fourth set," says Murray.
#bbctennis
Matt: Twistier and turnier than a twisty-turny thing
Jarleth Eaton: We all thought the Olympic final was great, but this one in turning into a classic! Come on Andy!
Tigerblade316: Great match so far, Murray v Del Potro rarely disappoints !!!
Murray 4-6 7-5 3-4 Del Potro*
Andy Murray pitches on right up onto Juan Martin del Potro's big toes and the Argentine cranks back into the net to hand over another break point.
A wide serve that Murray would have needed to be somewhere out in the Edinburgh suburbs to return sweeps that off the table.
On we go.
Murray 4-6 7-5 3-4 Del Potro*
Juan Martin del Potro gifts Andy Murray 15-15 with an apology of a drop-shot that slides down the gullet of the gutter.
A choked backhand slice is another freebie for Murray and 15-30.
A big Delpo serve brings up 30-30.
Murray with a shot up the line on that yippy backhand. It solidifies under pressure. Sure, steady and onto the paint.
Break point. Delpo knocks him back with another big serve, but Murray is massing for the big haul.
Murray 4-6 7-5 3-4 Del Potro*
John Lloyd
Former GB Davis Cup captain on BBC Two
Murray's match against Nishikori earlier this year was one of the best I had seen in Davis Cup, but in terms of quality this match surpasses it.
Del Potro is taking big risks on the forehand and Murray was just outplayed. The quality is staggering.
But such is the quality of Murray's returns you feel this set is still a long way from being over.
Murray 4-6 7-5 3-4 Del Potro*
Juan Martin del Potro brings up break point with an overhead that splits the Emirates Arena air like a nail gun. 30-40.
Andy Murray is scurrying, Juan Martin del Potro's forehand is spitting fire, and finally the Scot is run out of town on the baseline.
Advantage Argentina once again.
*Murray 4-6 7-5 3-3 Del Potro
This is a match with more twists and turns than a epic box set series.
Andy Murray channels his frustration into sheer brilliance and wipes out Juan Martin del Potro's break by return of post.
This match is really alive and kicking. If you are not watching at the top of this page, forget data limits, ignore the boss and hit play.
Murray 4-6 7-5 2-3 Del Potro*
John Lloyd
Former GB Davis Cup captain on BBC Two
What is the umpire supposed to do? He could take the line judge off the court but there is not much else he could do.
Murray 4-6 7-5 2-3 *Del Potro
Andy Murray has gone off radar mentally since that line judge's poor call a game and a half ago.
He is still chuntering about it as he sits down a break to the bad in the third set.
*Murray 4-6 7-5 2-2 Del Potro
Andy Murray playing high-wire tennis, he saves a break point with a superb drop-shot that scrapes over the wire and beats Juan Martin del Potro all ends up.
Here comes another break point though.
*Murray 4-6 7-5 2-2 Del Potro
John Lloyd
Former GB Davis Cup captain on BBC Two
Murray is so good now you just expect him to hit aces on big points.