Murray hopes to build on best season of his career

In a must-win match for them, Andy and Jamie Murray claimed a hard-fought 3-1 victory over Juan Martin del Potro and Leonardo Mayer in Emirates Arena in Glasgow, by 6-1 3-6 6-4 6-4 after 2 hours and 55 minutes.

Over the summer, the 2009 US Open champion has re-established himself in the tennis elite by winning a silver medal at the Olympics and making the quarterfinals at Flushing Meadows, and he played some astonishing tennis on Friday to defeat Andy Murray in a match that spanned five sets, five hours and dozens of emotions.

It ended a run of 14 successive singles wins in the Davis Cup and left the holders with an uphill task if they are to reach the final in November against France or Croatia.

After a 79-year wait for Davis Cup glory, Great Britain head into this season's semi-finals as the odds-on favourites to lift the trophy for the second year in succession.

Still, Murray brothers saved their best tennis for the end, taking the final 3 games to clinch the set 6-4 and retake the overall lead to 2-1.

"Two-one down is a tough position to be in", Andy Murray said, "but we are closer than we were at the start of the day and I still believe we can come back". 'He played unbelievable the whole match'. "At the end of last year, Davis Cup for all of us was a priority but I don't think at the beginning of the year we expected to win the event".

"For me, to play with my brother in front of a Scottish crowd it is quite emotional", a teary-eyed Jamie Murray said.

Even so, the hosts trail two matches to one after Murray lost 6-4, 5-7, 6-7 (5-7), 6-3, 6-4 to Del Potro and 21-year-old Kyle Edmund fell to Guido Pella 6-7 (5-7), 6-4, 6-3, 6-2 on Friday.

"I have to be smart", said Del Potro.

Britain kept their hopes of retaining the Davis Cup alive thanks to a terrific backs-to-the-wall effort from brothers Andy and Jamie Murray on Saturday.

Murray will open the semifinal in Glasgow with a singles against Juan Martin del Potro, in a replay of the Olympic final won by Murray in four sets last month.

"Everyone obviously feels flat just now - that's normal".

In the play-offs, where the winners earn places in the World Group in 2017, Olympic champions Rafael Nadal and Marc Lopez beat Leander Paes and Saketh Myneni 4-6, 7-6 (7/2), 6-4, 6-4 to secure a 3-0 triumph for Spain over India in New Delhi. But I knew that he liked these conditions.

"Both of us came up with good stuff and the shot he came up with to break in the fifth set was the difference", he added. "I'll be exhausted and I have to except that and deal with it and try and play the match on my terms if possible".

Judy said: "They don't get home very often, they are both based in London now, so when they are here it's important to try and make the most of that". But anyone with any previous exposure to Britain's Davis Cup ties must have realised this couldn't possibly continue in such a one-sided, straightforward manner, and the South Americans took the second set and were well-placed to snaffle the third, too, after breaking for a 4-3 lead.