Canadian teenager Bianca Andreescu beats Serena Williams in the US Open final to claim her first Grand Slam title.

Andreescu took charge early in the match, going up by a set and two breaks, then held off a late charge by Williams to win 6-3, 7-5 for the championship Saturday night.

The 19-year-old is the first woman to win the US Open in her tournament debut in the Open era, which began in 1968.

Her victory on Saturday prevented Williams from claiming what would have been her record-tying 24th major singles championship.

This is the second year in a row that Williams has lost in the US Open final. This one had none of the controversy of 2018, when she got into an extended argument with the chair umpire while being beaten by Naomi Osaka.

US Open 2019 - best pictures Show all 64 1 /64 US Open 2019 - best pictures US Open 2019 - best pictures Day one A plane comes in over the New York City skyline as seen from the Arthur Ashe Stadium AFP/Getty Images US Open 2019 - best pictures Day one The opening ceremony before the match of Serena Williams of the US against Maria Sharapova from Russia AFP/Getty Images US Open 2019 - best pictures Day One Cameron Norrie of Great Britain returns a shot during his men's singles first round match against Gregoire Barrere of France Getty Images US Open 2019 - best pictures Day one Maria Sharapova of Russia returns the ball to Serena Williams AFP/Getty Images US Open 2019 - best pictures Day one Roger Federer of Switzerland throws balls to members of the public after defeating Sumit Nagal AFP/Getty Images US Open 2019 - best pictures Day two Garbine Muguruza of Spain hits a return against Alison Riske AFP/Getty Images US Open 2019 - best pictures Day two Garbine Muguruza of Spain serves against Alison Riske AFP/Getty Images US Open 2019 - best pictures Day two Dominic Thiem of Austria against Thomas Fabbiano of Italy AFP/Getty Images US Open 2019 - best pictures Day three Novak Djokovic of Serbia receives treatment between games against Juan Ignacio Londero of Argentina AFP/Getty Images US Open 2019 - best pictures Day three Novak Djokovic of Serbia celebrates after defeating Juan Ignacio Londero AFP/Getty Images US Open 2019 - best pictures Day three Serena Williams of the US celebrates her wictory against Caty McNally AFP/Getty Images US Open 2019 - best pictures Day three Serena Williams of the United States reacts during her Women's Singles second round match against Catherine McNally Getty Images US Open 2019 - best pictures Day three Roger Federer of Switzerland celebrates after defeating Damir Dzumhur of Bosnia and Herzegovina AFP/Getty Images US Open 2019 - best pictures Day four Taylor Townsend of the US reacts after winning against Simona Halep AFP/Getty Images US Open 2019 - best pictures Day four Coco Gauff of the US reacts to winning her match against Timea Babos of Hungary AFP/Getty Images US Open 2019 - best pictures Day four Alexander Zverev of Germany celebrates after defeating Frances Tiafoe of the US AFP/Getty Images US Open 2019 - best pictures Day five Serena Williams of the United States reacts during of her Women's Singles round three match against Karolina Muchova of the Czech Republic Getty Images US Open 2019 - best pictures Day six Naomi Osaka of Japan consoles Coco Gauff EPA US Open 2019 - best pictures Day six Naomi Osaka of Japan consoles Coco Gauff USA TODAY Sports US Open 2019 - best pictures Day six Rafael Nadal of Spain serves against Hyeon Chung of Korea USA TODAY Sports US Open 2019 - best pictures Day six Rafael Nadal from Spain serves to Hyeon Chung from Korea AFP/Getty Images US Open 2019 - best pictures Day six Hyeon Chung of South Korea hits a return to Rafael Nadal of Spain EPA US Open 2019 - best pictures Day six Gael Monfils of France celebrates after his match against Denis Shapovalov of Canada USA TODAY Sports US Open 2019 - best pictures Day six Nick Kyrgios of Australia reacts vs Andrey Rublev EPA US Open 2019 - best pictures Day six Andrey Rublev of Russia celebrates winning his Men's Singles third round match against Nick Kyrgios of Australia Getty Images US Open 2019 - best pictures Day seven Novak Djokovic retired from his US Open clash with Stanislas Wawrinka due to a left shoulder injury AFP/Getty US Open 2019 - best pictures Day seven Serena Williams of the United States celebrates after winning her Women's Singles fourth round match against Petra Martic of Croatia Getty Images US Open 2019 - best pictures Day seven Roger Federer made light work of David Goffin Reuters US Open 2019 - best pictures Day seven Johanna Konta celebrates beating Karolina Pliskova on her way to the quarter-finals Getty Images US Open 2019 - best pictures Day seven Qiang Wang of China celebrates winning her Women's Singles fourth round match against Ashleigh Barty of Australia Getty Images US Open 2019 - best pictures Day eight Osaka struggled against Bencic AFP/Getty US Open 2019 - best pictures Day eight Osaka waves goodbye to the US Open fans USA Today US Open 2019 - best pictures Day eight Rafael Nadal saw off Marin Cilic to reach the US Open last eight AFP/Getty US Open 2019 - best pictures Day eight Marin Cilic lost to Nadal in four sets after putting up a good fight AP US Open 2019 - best pictures Day eight Alexander Zverev of Germany reacts as he plays against Diego Schwartzman of Argentina AFP/Getty Images US Open 2019 - best pictures Day eight Alexander Zverev receives a code violation during his defeat by Diego Schwartzman Getty Images US Open 2019 - best pictures Day nine Roger Federer of Switzerland hits a backhand against Grigor Dmitrov USA TODAY Sports US Open 2019 - best pictures Day nine Grigor Dimitrov of Bulgaria falls as he plays Roger Federer of Switzerland EPA US Open 2019 - best pictures Day nine Grigor Dimitrov of Bulgaria wins the quarterfinal match against Roger Federer of Switzerland USA TODAY Sports US Open 2019 - best pictures Day nine Roger Federer of Switzerland reacts as he leaves the court after losing to Grigor Dimitrov of Bulgaria EPA US Open 2019 - best pictures Day nine Daniil Medvedev of Russia hits a return to Stan Wawrinka of Switzerland EPA US Open 2019 - best pictures Day nine Daniil Medvedev of Russia (L) hugs Stan Wawrinka of Switzerland after defeating him in their Men's Singles Quarterfinal match AFP/Getty Images US Open 2019 - best pictures Day nine Daniil Medvedev of Russia is interviewed on court after beating Stan Wawrinka USA TODAY Sports US Open 2019 - best pictures Day nine The sun sets behind the Manhattan skyline as Serena Williams of the United States faces Qiang Wang of China in a quarterfinal match USA TODAY Sports US Open 2019 - best pictures Day nine Serena Williams of the US reacts after defeating Qiang Wang of China during their quarter-finals round match EPA US Open 2019 - best pictures Day nine Serena Williams, of the United States, returns a shot to Qiang Wang, of China, during the quarterfinals AP US Open 2019 - best pictures Day 10 Rafael Nadal celebrates his victory over Diego Schwartzman in the US Open quarter-finals AFP/Getty US Open 2019 - best pictures Day 10 Matteo Berrettini celebrates after beating Gael Monfil to reach the semi-finals Reuters US Open 2019 - best pictures Day 10 Bianca Andreescu is through to the semi-finals of a Grand Slam for the first time Getty US Open 2019 - best pictures Day 10 Belinda Bencic reached the last four of the US Open Getty US Open 2019 - best pictures Day 11 Serena Williams came past Elina Svitolina to reach yet another US Open final Getty Images US Open 2019 - best pictures Day 11 Bianca Andreescu beats Belinda Bencic in the semi-finals Getty Images US Open 2019 - best pictures Day 12 Rafael Nadal reaches the final where he will play Daniil Medvedev Getty Images US Open 2019 - best pictures Day 13 Bianca Andreescu arrives on court listening to music before the final Getty US Open 2019 - best pictures Day 13 Bianca Andreescu reacts as she wins against Serena Williams of the during the women's singles final – her first grand slam title AFP/Getty Images US Open 2019 - best pictures Day 13 Bianca Andreescu of Canada reacts as she wins against Serena Williams of the US during the Women's Singles Finals match AFP/Getty Images US Open 2019 - best pictures Day 13 Bianca Andreescu poses with the trophy after she won against Serena Williams AFP/Getty Images US Open 2019 - best pictures Day 14 Bianca Andreescu of Canada poses with her trophy at the Top of the Rock in Rockefeller Center Getty Images US Open 2019 - best pictures Day 14 Daniil Medvedev of Russia wipes his face while playing Rafael Nadal AFP/Getty Images US Open 2019 - best pictures Day 14 Rafael Nadal, of Spain, reacts after defeating Daniil Medvedev, of Russia, to win the men's singles final of the U.S. Open AP US Open 2019 - best pictures Day 14 Rafael Nadal of Spain reacts after defeating Daniil Medvedev of Russia during the men's final match EPA US Open 2019 - best pictures Day 14 Rafael Nadal of Spain reacts during the men's Singles Finals match against Daniil Medvedev AFP/Getty Images US Open 2019 - best pictures Day 14 Rafael Nadal of Spain (L) celebrates his victory over Daniil Medvedev of Russia (R) AFP/Getty Images US Open 2019 - best pictures Day 14 Rafael Nadal of Spain holds the trophy after his win over Daniil Medvedev AFP/Getty Images

She has now been the runner-up at four of the seven majors she has entered since returning to the tour after having a baby two years ago.

Andreescu displayed the same sort of big serving and big hitting that Williams usually does. Williams was not at her best, either, getting tight at key moments, including double-faulting on the last point of three games to get broken.

She went up 5-1 in the second set and served for the victory there, even holding a match point at 40-30. But Williams erased that with a forehand return winner off a 105 mph serve.

That launched a four-game run for Williams, who broke Andreescu again to make it five-all. The Arthur Ashe Stadium crowd was overwhelmingly supporting Williams, not surprisingly, and spectators got so loud as she tried to put together a successful comeback that Andreescu covered her ears with her hands after one point.

Suddenly, this was a contest.

But as well as Andreescu handled everything — herself, her far-more-experienced and successful opponent, and even the moment — Williams was far from her best, especially while serving. She got broken for the sixth time in the final game.

Andreescu only has participated in four majors in her brief career.

A year ago, Andreescu was losing in the opening round of qualifying.