NEW YORK (AP) — Canadian teenager Bianca Andreescu has reached the final in her U.S. Open debut by beating No. 13 seed Belinda Bencic of Switzerland 7-6 (3), 7-5.

The 19-year-old Andreescu is appearing in only her fourth Grand Slam tournament. She had never been past the second round at a major.

Andreescu will face 23-time Slam champion Serena Williams for the championship on Saturday.

Andreescu is the first woman to reach the final in her first appearance in the main draw at Flushing Meadows since Williams’ older sister, Venus, did it in 1997.

The 15th-seeded Andreescu trailed Bencic 4-1 and 5-2 in the second set before taking the last five games.

Bianca Andreescu of Canada after winning her Women’s Singles semi-final match against Belinda Bencic of Switzerland on day eleven of the 2019 US Open at the USTA Billie Jean King National Tennis Center on September 05, 2019. (Photo by Clive Brunskill/Getty Images)

Serena Williams beat Elina Svitolina 6-3, 6-1 in the U.S. Open semifinals to give herself another shot at winning a record-equaling 24th Grand Slam title.

A year ago, Williams lost a controversial and chaotic final in New York to Naomi Osaka.

Williams already owns six U.S. Open titles and 23 major championships in all. That total is a record in the Open era, which began in 1968 when professionals were first allowed to play in Grand Slam tournaments.

The only player with more is Margaret Court, who won more than half of her 24 trophies against amateur competition.

Serena Williams of the United States returns a shot during her Women’s Singles semi-final match against Elina Svitolina of the Ukraine on day eleven of the 2019 US Open at the USTA Billie Jean King National Tennis Center on September 05, 2019. (Photo by Emilee Chinn/Getty Images)

(© Copyright 2019 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)