Adam Peaty wins Great Britain's first gold
There was an error
Sorry, this video is temporarily unavailable. Please try again later.
Team GB's Adam Peaty has smashed his own world record to take Olympic gold in the men's 100 metre breaststroke.
He finished the race in 57.13 seconds, which was over a second ahead of his nearest rival in the pool.
His gold is Great Britain's first medal of the Rio Olympics.
Watch Naz's report.