Hello and welcome to LIVE updates from Day two of the Davis Cup semi final between holders, Great Britain and Argentina at Glasgow's Commonwealth Arena. Today we focus on the doubles with the Murray brothers set to lock horns with Leonardo Mayer and Juan Martin Del Potro (a late call-up instead of Federico Delbonis). Argentina lead the tie 2-0 following the first of the singles rubbers, so holders GB know they need to win here to have any chance of retaining their title.

So, GB live to fight another day and have cut the deficit to 2-1 at the end of Day Two of this Davis Cup semi final. Sunday's schedule is set to start at 1pm BST with Andy Murray pencilled into meet Guido Pella. The final singles rubber - and quite possibly a crucial one - would see Del Potro meet Edmund as it stands, though a fresh Dan Evans could well come in. Join us again to see if GB can pull off a sensational comeback and keep their hopes of retaining the trophy alive.

Roll on Day Three!

GAME, SET AND MATCH! - GREAT BRITAIN 6-1 3-6 6-4 6-4 ARGENTINA. GB are back in the tie! They reduce the arrears as the Murray brothers do the business in the doubles for the sixth time on the spin with a four-set success in two hours and 55 minutes. They break to love on the first of three match points with Andy smashing down a volley to conclude.

GREAT BRITAIN 6-1 3-6 6-4 5-4 ARGENTINA. Too good once again. Jamie cranks up the heat on his second serve and is rewarded for his bravery with a comfortable hold for the loss of one point. Argentina serving to stay in it next.

GREAT BRITAIN 6-1 3-6 6-4 4-4 ARGENTINA. No room for error in this set now! Delpo sees a 30-0 lead erode on his serve but at 30-30 Jamie's lob approach is just long of the baseline. Andy nets a crosscourt attempt and a chance to turn the screw goes begging.

GREAT BRITAIN 6-1 3-6 6-4 4-3 ARGENTINA. Both teams excelling on serve at the moment. Andy has come under attack as the one Argentina identify as the weaker link in doubles but he doesn't flinch on this occasion. GB take it to 15 and keep that pressure on. Now would be the perfect time for the holders to break. That'd leave Jamie serving for the match....

GREAT BRITAIN 6-1 3-6 6-4 3-3 ARGENTINA. The visitors are staying strong. They still believe they can win the tie today. Mayer with some majestic serving as he holds to 15. Not much for GB to bite at there.

Leon Smith with more words of encouragement as he tries to help his players over the finish line.

GREAT BRITAIN 6-1 3-6 6-4 3-2 ARGENTINA. Fine serving from Jamie and some smart net coverage from Andy keep GB on course. Intelligent and effective stuff from the brothers.

GREAT BRITAIN 6-1 3-6 6-4 2-2 ARGENTINA. The away side secure a simple enough hold to 15. All square.

The Davis Cup is always full of strange sights!

GREAT BRITAIN 6-1 3-6 6-4 2-1 ARGENTINA. Andy keeps GB's nose in front with a hold to 30. The younger Murray finishes it off at the net as they breach Argentina's defences at the third overhead attempt.

GREAT BRITAIN 6-1 3-6 6-4 1-1 ARGENTINA. Mayer's serve us put under the microscope. GB have a break opportunity at 30-40 but Argentina save it in a sensational point involving great technique on both sides of the court. The visitors do just enough to get on the board with the holders keen to get this finished in this set.

Delpo must feel a bit like this again...

GREAT BRITAIN 6-1 3-6 6-4 1-0 ARGENTINA. The spring is in GB steps at 30-0 but Argentina make it tricky and push Jamie all the way to deuce before the older Murray guides a volley to the back of the court to give the hosts the scoreboard advantage at the start of the fourth.

Go GB, go GB go...

SET! - GREAT BRITAIN 6-1 3-6 6-4 ARGENTINA. GB break again and lead 2-1! They turn it around in spectacular fashion at the end of the third after it had looked like Argentina were in the driving seat. The visitors clearly tighten under the pressure of serving to stay in it. Delpo lobs long to offer up set point and Andy steers a return winner down the line to give the holders belief.

GREAT BRITAIN 6-1 3-6 5-4 ARGENTINA. It's not Jamie's best service games but it'll do at this stage. GB pile on the scoreboard pressure as the older brother holds to 30 despite serving his first double fault of the match. Andy almost turns his back on a rifled approach at the net on what proves to be the concluding point but somehow stuns a block volley over.