The 15-year-old’s victory in New York came 24 hours after Jack Draper’s semi-final defeat to world number one Jannik Skinner in the men’s draw.
A British teenager has become the first tennis player from the UK to win a US Open junior title in 15 years.
Mika Stojsavljevic, 15, beat her Japanese opponent Wakana Sonobe 6-4 6-4 to lift the championship cup in New York on Saturday.