After beating Novak Djokovic in 4hrs 54 mins to end Britain's 76-year wait for a men's Grand Slam singles champion, he soaked up the moment with a walk in New York and then went to Central Park posing for photographs hugging the US Open trophy.
Andy's mother Judy cried tears of joy said: "He's been dreaming of winning a Grand Slam since he was little and it has been his goal since he became a full-time player – that is all he has talked about.
"He has obviously come close on a number of occasions and not quite been able to do it and I think winning the gold at the Olympics gave him the belief he could get through a major final.
"To see him do it was fantastic. I probably know better than anybody how hard he has worked over how long a time and I know much it means to him, so it was great to be able to see him get what he deserved."
In the 25-year-old's home town of Dunblane, his grandparents stayed up – as did most of the town residents– to watch Andy play his way into the history books.
Shirley and Roy Erskine said they had received congratulatory phone calls from all over the world, and had got very little sleep.
Mrs Erskine said: "It was a late finish but we're so glad we saw it all. He has had an amazing summer and we are just so delighted and proud of what he has achieved.
"Andy was a handful as a child, (his brother) Jamie was much more laid back and when they played board games the board would go on the floor if Andy wasn't winning.
"It was a problem at the time but now you look back and recognise the temperament and the desire you need to always win.
"He had a temper on him and would always stamp his foot and say, 'I've got to do better, I've got to get better', but he focused that eventually and used his energy to play tennis."
Mr Erskine said there was no question his win against Roger Federer at the Olympics boosted his confidence.
He said: "That set him on the path and gave him the extra confidence, along with his coach (Ivan) Lendl, who has been good for his focus."
Dunblane has a gold post box that marks Murray's London 2012 victory and fans had packed into the Dunblane Hotel erupting into chants of "There's only one Andy Murray" when he won the match.
David Marshall, chief executive of Tennis Scotland, said the thrilling match was world-class and said: "Maybe we could have a platinum post box in the town now."
Scotland's First Minister Alex Salmond said: "Andy truly is a Scottish sporting legend and I am certain more Grand Slam titles will follow."
Stirling Council, which presides over Dunblane, said it was looking to give the tennis star a homecoming fit for a hero. Officials are keen to offer him the Freedom Of The City Of Stirling and are in talks with his management.
Scottish Labour's Deputy Leader and Glasgow Central MP Anas Sarwar called for Murray to receive a knighthood and has tabled an Early Day Motion in Westminster.
He said: "It is only right and proper his achievements are recognised and I can think of nothing better than 'Arise Sir Andy'."