London - Britain's Andy Murray demolished a tired-looking Roger Federer 6-2, 6-1, 6-4 in the Olympic men's final on Sunday to win his first gold medal and avenge his Wimbledon final defeat against the world No 1.
Just four weeks after breaking down in tears when Federer shattered his hopes of a first Wimbledon title, Murray returned to Centre Court to rout the Swiss great in just one hour and 56 minutes.
Murray, who has denied Federer a coveted first singles gold, could yet finish the Games with two gold medals as he will be back in action in the mixed doubles final with partner Laura Robson against Max Mirnyi and Victoria Azarenka of Belarus later on Sunday.
It is the greatest moment of Murray's career to date and just reward for an astonishing display that must rank alongside the best ever seen on the sport's most hallowed court.
The 25-year-old Scot, beaten in three Grand Slam finals by Federer, has been in superb form all week, but even he couldn't have dreamt he would win gold like this.
Not only did the world No 4 do it by beating the Swiss for the first time since 2010, Murray also handed the 17-time Grand Slam winner his heaviest defeat in a best-of-three-sets final since Rafael Nadal thrashed him for the loss of just four games in the 2008 French Open final.
For Federer, a doubles gold medallist with Stanislas Wawrinka in Beijing in 2008, this final was meant to be the crowning glory of his career.
Instead, Federer, who will be 35 by the time the Rio Games are in full swing in 2016, may wonder if he will ever get a chance to win the Golden Slam of all four majors and singles gold.
Murray had hoped the final would be staged with the Centre Court roof open as he felt his Wimbledon defeat was in part due to Federer thriving after a switch to indoor play when rain hit when the match was level at one-set all.
He got his wish as the heavy rain that lashed the All England Club earlier in the day relented just before the scheduled start.
And when Murray gave Federer two break points in the opening game, his response to the crisis, a series of perfectly-placed winners, was symbolic of his impressive form this week.
The Scot's new-found maturity and increased muscularity are a potent package and he set about Federer with controlled fury in the sixth game.
A fine serve from Federer saved the first of two break points, but Murray came up with a searing return on the next and the Swiss could only direct his forehand into the net.
Everything that Federer threw at Murray was sent back with interest by the Scot, who clinched the first set with a second break when he smashed a backhand winner down the line.
Murray had taken the first set in the Wimbledon final as well before missing a chance to break in the second and then running out of steam.
He wasn't going to make the same mistake again.
In the second game of the second set, Federer put an easy smash into the net before the Scot enjoyed a slice of luck as two net cords in quick succession went his way to secure the break.
Federer tried to stem the tide in the next game, an epic struggle that featured six break points for the Swiss. But Murray wouldn't be denied and found the right response on each occasion.
The Swiss great had never been given such a torrid time on his favourite Centre Court. He looked shell-shocked by Murray's assault and served a double-fault on break point in the next game to give the Scot his eighth successive game.
With the second set in the bag, Murray kept his foot on the gas in the third and delivered the knockout blow when he produced a stunning winner to break for a 3-2 lead.
Federer had nothing left, especially after a four-and-a-half hour marathon against Juan Martin del Potro on Friday, and Murray sealed the win with two thunderous aces before clambering into the players' box to embrace his family and backroom staff.
Results on Sunday of the tennis event from the Summer Olympics:
Juan Martin del Potro (8), Argentina, def. Novak Djokovic (2), Serbia, 7-5, 6-4.
Andy Murray (3), Britain, def. Roger Federer (1), Switzerland, 6-2, 6-1, 6-4.
Maria Kirilenko and Nadia Petrova (3), Russia, def. Liezel Huber and Lisa Raymond (1), United States, 4-6, 6-4, 6-1.
Serena Williams and Venus Williams, United States, def. Andrea Hlavackova and Lucie Hradecka (4), Czech Republic, 6-4, 6-4.
Lisa Raymond and Mike Bryan (3), United States, def. Sabine Lisicki and Christopher Kas, Germany, 6-3, 4-6, 1-0 (10/4).
Victoria Azarenka and Max Mirnyi (1), Belarus, def. Laura Robson and Andy Murray, Britain, 2-6, 6-3, 1-0 (10/8).