Guo produced five unanswered points in the closing stages of her final to defeat Britain’s European champion Carolina Stutchbury 15-6 and was overcome with emotion after her victory.

"It feels great, there were a lot of close bouts," Guo said.

"The bout where I got into the top four was a crazy one but I felt great after that.

"The hardest thing was keeping my resilience and pushing through my bouts, everything was so close, I had to be there mentally."

Guo from Toronto, had won 2019 Pan American Games silver aged only 14 and had fenced at the Olympics in Tokyo.

There were bronzes for Rino Nagase of Japan and Matilde Molinari of Italy.

In the men's final, Cheng Tit Nam claimed gold for Hong Kong with a dominant performance. 

He was in control throughout, defeating Ruben Lindner of Germany 15-6.

"Of course, I’m very excited, and I have fulfilled my promise to myself from a few years ago in 2019 when I lost in an early round in Poland at this same event," Nam said. 

"I said, ‘I’m going to be on that podium and get that gold,’ and I did it. Also, I fenced in the juniors yesterday, and since I’m tired, I was able to tell myself to be calm and not nervous. I trusted myself."

Matteo Iacomoni of Italy and American fencer Andrew Chen had to settle for bronze medals.