Watch the winning momentpublished at 17:30
After almost four hours of intense battle... here's how the match was won.
Great Britain beat Australia in Davis Cup doubles
Summary
Andy and Jamie Murray beat Sam Groth and Lleyton Hewitt
Britain win 4-6 6-3 6-4 6-7 (6-8) 6-4
GB lead best-of-five tie 2-1 after two days
Britain aiming to reach first final since 1978
Live Reporting
James Gheerbrant
Watch the winning momentpublished at 17:30
Media caption, Postpublished at 17:27
17:27Postpublished at 17:12 British Summer Time 19 September 2015
17:12 BST 19 September 2015Aussies fightbackpublished at 16:50
16:50Just when you think Great Britain had it sown up, Australia come back to take the match into a final-set showdown. Here's the crucial tie-break decider...
Media caption, Australia win tie-break to take the match to the final set
Postpublished at 16:36 British Summer Time 19 September 2015
16:36 BST 19 September 2015Point of the match so farpublished at 15:45
15:45This is how to play doubles...
Media caption, 'Point of the match' for the Murray brothers.
Postpublished at 15:38 British Summer Time 19 September 2015
15:38 BST 19 September 2015Here's one they won earlierpublished at 15:04
15:04If Andy and Jamie need some inspiration, well I reckon they could find some in this clip, and the crowd's reaction, as they win the second set.
Media caption, Murray brothers level Davis Cup semi-final doubles match
Postpublished at 14:19 British Summer Time 19 September 2015
14:19 BST 19 September 2015Here's how to celebrate...published at 14:17 British Summer Time 19 September 2015
14:17 BST 19 September 2015Media caption, Australia celebrate break with chest-bump
Get Involved #bbctennispublished at 14:14 British Summer Time 19 September 2015
14:14 BST 19 September 2015