British cyclist Chris Hoy clinched a hat-trick of gold medals as he beat team-mate Jason Kenny in the sprint.
The 32-year-old becomes the first Briton in 100 years to win three golds at the same Olympics, after his earlier success in the team sprint and keirin.
The Scot was pushed to the limit in the first race by his 20-year-old opponent, edging the opening duel in the best-of-three by half a wheel's length.
Hoy dominated the second race, giving a victory salute as he crossed the line.
"I cannot tell you how it feels - it is amazing," Hoy told BBC Sport.
"Beating him was really tough - it was probably the hardest race of my life."
The bronze medal went to Mickael Bourgain of France after he dominated Germany's Maximilian Levy in a third-leg decider.
Hoy's gold was the last to be decided in the velodrome and left the British team with an incredible haul of seven golds from a possible 10 in track cycling in Beijing.
It was also Team GB's 15th gold medal of the Games, keeping them third in the medal table.
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