She said: “I still can’t quite believe it. I had to actually double-check the score at the end of the match. I thought it was a first serve maybe.
“I’m just really pleased to be into the second round. I feel like I’m playing and everything is just a bonus to me right now. I’m just really enjoying myself, just taking the moment in really.
“The support I had today was quite incredible. They definitely pushed me through some of the tough moments.”
Against Vondrousova, Raducanu was up against an ever tougher test with the 22-year-old finishing runner-up in the 2019 French Open final.
But Raducanu looked far from fazed by the level of her opposition, making a fast start in the first set.
She won the first set in 29 minutes and then battled back from 0-3 down in the second set to win in one hour and 12 minutes.
The world 338 only sat her A Levels two months ago – and is now guaranteed to win at least £115,00.
She will face Romanian Sorana Cirstea in the next round.