Shaunna Thompson completed a sprint double at the Commonwealth Youth Games in India when she won 200m gold.
The 16-year-old from Manchester, one of British athletics' rising stars, equalled her personal best of 23.42 seconds in a championship record.
Thompson won the 100m title, also in a championship record time, on Tuesday.
"To win two gold medals at these Games has exceeded my expectations and I'm delighted to set another Youth Games record," she said.
"My focus now is the European Juniors next summer."
Thompson previously hit the headlines when she faced a panel of five millionaires on the ITV show 'Fortune: Million Pound Giveaway' and persuaded them to part with £30,000 to aid her training.
Her name was put forward by her teacher, and she battled past hundreds of contenders to land a £6,000-a-year deal until the London Olympics.
Thompson, this year's England Under-17 champion, said the money had been a huge help in covering kit, physiotherapy and travel costs.