Cori became the youngest woman to win a main-draw Wimbledon match since Jennifer Capriati beat defending champion Martina Navratilova in 1991
She won 6-4, 6-4 before collapsing onto the Court 1 grass clutching her face while the emotions spilt out.
‘Now I have had the guts to,’ said the 15-year-old, having composed herself after the emotional moment of victory, when a look of disbelief spread across her face.
‘I want to be the greatest. My dad told me that I could do this when I was eight,’ she reflected.
‘Obviously you never believe it. I’m still not 100 per cent confident. Now my goal is to win it.’
The tennis prodigy entered her Wimbledon debut ranked 313th by the Women’s Tennis Association, while Williams entered 44th.