RIO DE JANEIRO - Great Britain's Adam Peaty broke the men's 100m breaststroke world record for the second time in as many days en route to winning gold.
The 21-year-old stopped the clock at 57.13 seconds on Sunday, eclipsing the 57.55sec mark he set with his first ever Olympic swim in the heats.
Defending champion Cameron van der Burgh of South Africa won silver at the Olympic Aquatics Stadium in 58.69sec. American Cody Miller took bronze (58.87sec).
Peaty told the BBC: "It's so surreal to get Team GB's first gold. This is a product of seven years' work. I did it for my country. It means so much to me."
Peaty is the first British swimmer in 28 years to win this event at the Olympic. Compatriot Adrian Moorhouse was victorious at the 1988 Seoul Games.