Double Olympic champion wins in race against high school students to promote sport
Semenya was taking part in the "Classic Shootout", a meet which features South Africa's top athletes racing alongside high school students.
The meet aims to get high school students to take up athletics and sport for enjoyment and competition.
"I am here to stay. Track and field, you will still see my face," said Semenya. "That is all I can say for now."
The 29-year-old is unbeaten in 31 straight races over that distance.
However, the rules do not cover distances under 400 metres or over one mile, meaning she was free to run in this 300m race.
She is currently appealing the regulations (and the Court of Arbitration of Sport's decision to uphold them) to the Swiss Federal Supreme Court.