British teenager Emma Raducanu arrived last month with a ranking of 150th, just one Grand Slam appearance to her name and a flight booked to head out of town after the US Open’s preliminary rounds in case she failed to win her way into the main tournament.

And there she was in Arthur Ashe Stadium on Saturday, holding a trophy to complete an unlikely — indeed, unprecedented — yet surprisingly dominant journey from qualifier to major champion by beating Canadian teenager Leylah Fernandez 6-4, 6-3 in the final.

She is the female qualifier to reach a Grand Slam final, let alone win one. She captured 10 matches in a row at Flushing Meadows — three in qualifying, seven in the main draw — and is the first woman to win the US Open title without dropping a set since Serena Williams in 2014.

Raducanu, who was born in Toronto and moved to England with her family at age 2, also is the first British woman to win a Grand Slam singles trophy since Virginia Wade at Wimbledon in 1977. Queen Elizabeth II sent a congratulatory note, hailing the victory as a “remarkable achievement at such a young age.”