Andreescu matched Williams’ power throughout the slugfest and kept her composure under intense pressure to fend off a late comeback from the six-times U.S. Open champion.
The 19-year-old dropped her racket after hitting a blistering forehand return winner on match point to seal victory at Arthur Ashe Stadium and collapsed on her back after embracing her defeated opponent.
“It’s so hard to explain (what the win means) in words,” Andreescu said on-court.
“I’m just beyond grateful and truly blessed. I’ve worked really, really hard for this moment and I can’t complain. This year has been a dream come true,” she added before collecting her $3.85 million dollar winner’s check.
“And now to be able to play on this stage against Serena, a true legend of the sport, is amazing.”
Andreescu, the first Canadian to win a major in the professional era, prevented Williams from equalling Margaret Court’s record of 24 Grand Slam singles titles.
Williams, who has been denied the milestone in four slam finals since claiming her last major title at the Australian Open in 2017, was gracious in defeat.
“Bianca played an unbelievable match,” she said.
“Congratulations, I’m so proud and happy for you. I wish I could have played better.”
Earlier in the same stadium, Jamie Murray and Bethanie Mattek-Sands defended their U.S. Open mixed doubles title when they defeated Taiwan’s Chan Hao-Ching and New Zealand’s Michael Venus in straight sets under sunny skies.
The win burnished Murray’s reputation as one of the world’s leading doubles exponents, as the Briton enjoyed his third consecutive mixed doubles triumph at Flushing Meadows.
An elated Mattek-Sands, who suffered a grisly knee injury at Wimbledon two years ago, celebrated the 6-2, 6-3 win by taking a selfie on the court with Murray, older brother of former world No. 1 Andy who also won in 2017 with Martina Hingis.
(Production: Kurt Michael Hall)