The 18-year-old from Kent has yet to drop a set in only her second grand slam event after another outstanding display against the 11th seed and reigning Olympic champion.
Raducanu will face Maria Sakkari of Greece in the early hours of Friday morning for a scarcely believable place in the final.
Here, the PA news agency looks back on a momentous day 10 at Flushing Meadows.
Picture of the day
Tweet(s) of the day
The fan club is growing.
Stat of the day
That winning feeling
Quote of the day
What else happened?
There was the small matter of Novak Djokovic taking the next step towards the calendar grand slam, coming from a set down to beat Matteo Berrettini 5-7 6-2 6-2 6-3. He will face fourth seed Alexander Zverev who beat Lloyd Harris of South Africa in three sets, in the semi-final. Sakkari was a 6-4 6-4 winner over Wimbledon runner-up Karolina Pliskova.
Men: Matteo Berrettini (6).Women: Karolina Pliskova (4), Belinda Bencic (11).
Both women’s semi-finals take place at night on Arthur Ashe, with Raducanu second up at around 2am UK time after fellow teenager Leylah Fernandez takes on second seed Aryna Sabalenka. Earlier, Britain’s Joe Salisbury and Jamie Murray are in action in their respective men’s doubles semi-finals.
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