Andy Murray will be "on top of the world" after becoming both Wimbledon and Olympic champion in the same year, his grandfather has said.

Roy Erskine was watching his grandson's Olympic victory at home in Dunblane along with his wife Shirley.

Speaking as he waited to see the medal ceremony, he told the Press Association: "Both of us are very excited about the game. It was just fantastic.

"Four hours is a very long match.

"We can't really say an awful lot - he really did play so well. We are just elated for him.

"To be double Wimbledon champion and double Olympic champion and all the things he has done - he must be on top of the world."

Mr Erskine said he did not expect to see Murray for some time as he was soon heading to a tournament in Cincinnati and it would be at least another month before he returned to the UK.

He said of the tennis star's constant travelling: "He knows nothing else. That has been his life since he was 15 or 16.

"We will see him in Glasgow though for the Davis Cup so we will look forward to seeing him then."

Neither Murray's wife Kim nor mother Judy was in Rio to watch the match.

Mr Erskine said: "I am sure there will be a big celebration once they (Murray and his team) come back."

Judy Murray tweeted that the final match has been "4 hours of torture. Made slightly more bearable after I switched the sound off after 3 games".

She tweeted a picture of her television showing her son just after he had won, captioned "Warrior".

After the match, Murray, who carried Team GB's flag in the opening ceremony, said it was "one of the hardest matches" he has had to play for a major title.

He said: "Emotionally it was tough, physically it was hard with so many ups and downs in the match.

"The fact that it has never been done before shows it's a very difficult thing to do and I'm very proud to have been the first one to have done it.

"It's not easy, especially in four years, for a tennis player. I had back surgery since London and so many things can change - my ranking dropped and I've gone through some tough times off the court, so I'm happy that I'm still here competing for the big events."