On Saturday, July 14 she ran a Championship Record 22.50secs to win the 200m, adding to her 11.16 100m victory two days earlier.
“I’m so happy to win the double gold medal in Tampere,” said Williams, who is only 16 years old.
“I was a bit tired and nervous before the race,” added the American-born, who had six races in four days.
“It was a huge PR for me by over half a second, my coach gave me a tonne of advice – it’s so important to have him here. I want to act as a role model for young girls and to encourage them.”
“In the future, I want to be the youngest Olympic medalist in Tokyo 2020, but there are a lot of chances to succeed before then as well.”