RIO 2016: Andy Murray takes tennis title
TENNIS: Great Britain's Andy Murray has become the first man or woman to defend an Olympics singles title, defeating Juan Martin del Potro of Argentina.
Murray's 7-5 4-6 6-2 7-5 victory stretched his winning streak to a career-high 18 matches.
Del Potro, who knocked off No.1 Novak Djokovic in the first round and No.3 Rafael Nadal in the semi-finals, fought hard but ultimately came up short.
He won bronze four years ago.
Murray said after the match he was drained after his own poor play stretched the game out longer.
"I was tired," he said.
"We played four hours. That's hard on this surface.
"On a slow court that's a lot of running it was physically hard and I served badly which made the match tougher than it was already.
"The last few months since the clay court season started I've been competing for the biggest events in every tournament.
"I've had some good wins against the top players."
Kei Nishikori defeated Nadal for the bronze.
In an all-American mixed doubles final Bethanie Mattek-Sands and Jack Sock won the title against Venus Williams and Rajeev Ram.
The 6-7 (7-3) 6-1 10-7 win denied Williams a record fifth gold.
Swiss star Martina Hingis had to settle for silver as her and Timea Bacsinszky were beaten to gold 6-4 6-4 by Russians Ekaterina Makarova and Elena Vesnina.