Andy and Jamie Murray put Britain on brink of Davis Cup final

The 4-6 6-3 6-4 6-7(6-8) 6-4 triumph carried GB 2-1 ahead, with the two tie-concluding singles rubbers scheduled for Sunday.

Andy Murray will be overwhelming favourite to win his third point of the tie against Australian number one Bernard Tomic, assuming he can shrug off any effects of a sapping five-setter.

The British siblings roared back from a set down to seize control of the contest, only to meekly surrender when Andy served for the match in the fourth set. A jubilant Groth and Hewitt – thriving despite the partisan atmosphere – then clinched a topsy-turvy tie-break to force a decider.

The momentum swung back and forth in the final set, with the Australian duo refusing to go away, but the Murrays just had enough to creep over the finish line.

"It was an incredible match, to come back from the disappointment of losing the fourth set," said Andy Murray.

"We kept creating chances, we stuck together like brothers should and managed to come up with enough good returns.

"We had to keep the energy up at the beginning of the fifth set - it was important for us to get a good start."

The world number three's brother Jamie added: "We let it slip a bit but we kept fighting and got right back on it. It was so good, it was so noisy, it was magic.

"Scottish people don't get the chance to see Andy play very much and when they do they let him know it."

British captain Leon Smith confirmed that despite any tiredness, Murray will play if at all possible.

"Andy is the best player across both teams and if he can play, he should play," said Smith.

"Not only that, Andy and Jamie together are a great pair and what they did against France was absolutely outstanding, and they've done it again today. I think it was the right decision."

On Friday, Andy lost just six games as he beat Thanasi Kokkinakis, while Dan Evans fell to Tomic in four sets.

The winners will face either Belgium or Argentina in the final.

Argentina went 2-1 ahead in that match after winning the doubles rubber on Saturday in Brussels, as Carlos Berlocq and Leonardo Mayer beat Steve Darcis and Ruben Bemelmans 6-2 7-6(2) 5-7 7-6(5).