Bianca Andreescu defeated Serena Williams in the final, 6–3, 7–5 to win the women's singles tennis title at the 2019 US Open. It was her first major title. Andreescu was the first Canadian, as well as the first player born in the 2000s, to win a major singles title. She was the youngest player to win the title since Svetlana Kuznetsova in 2004, and the first woman to win the US Open on her main draw debut. This was the first time a player won a major on their debut appearance since Monica Seles won the 1991 Australian Open. In addition, Andreescu tied Seles’ Open Era record of the shortest time from major debut to winning a title, winning on her fourth major appearance. The final was a rematch of the Canadian Open final four weeks prior, also won by Andreescu. This was the largest age gap between two women's major finalists in the Open Era. With the win, Andreescu entered the top 5 in rankings for the first time.