Serena Williams and her daughter have left the tennis world stunned after sporting a matching dazzling outfit in her final grand slam tournament of her the American's sparkling career.
Williams was simply introduced as the 'greatest of all time' during her walkout to face Danka Kovinic on Arthur Ashe Stadium in front of a raucous home crowd.
'UNBELIEVABLE': Simona Halep US Open drama leaves tennis world in shock
Having announced the US Open would be her last tournament in a glittering career spanning more than 20 years, all eyes were on Williams on the first night in New York.
And living up to her billing as tennis royalty, Williams stunned the tennis world walking out onto court in an all-black outfit covered in diamonds.
Adding to the mystique, Williams' daughter Olympia was also seen in the crowd wearing a matching outfit and taking a photo of her mother.
The Nike outfit was designed by Williams and modelled after a figure-skater's dress.
The dress has six layers, to replicate her six US Open titles, and her shoes have a diamond encrusted Nike swoosh.
The tennis world was quick to lose their mind over the stunning outfit.
Many compared the sparking outfit to Williams' glittering career and said it was fitting the 23-time grand slam champ would go out shining in her final grand slam tournament.
Serena Williams will wear a figure skating-inspired Nike dress at the US Open that she designed — made of 6 layers to honor her 6 past titles at Flushing.
Her NikeCourt Flare 2 shoes include a diamond-encrusted Swoosh and solid gold lace deubrés with 400 hand-set diamonds. pic.twitter.com/9CxtGwQQlU
— Nick DePaula (@NickDePaula) August 29, 2022
Omg. Serena and Olympia are wearing matching black glittery outfits. I cannot 😍
— Joi-Marie (@joimariewrites) August 29, 2022
The stadium announcer calling her the GOAT
Olympia taking pics and screaming “Mommy!” in her matching dress
The sparkles all over the kit
That’s it, goodbye, I am a MESS
— TroubleFault (@troublefault) August 29, 2022
Serena's daughter, Olympia, getting ready to cheer her mom on in her matching outfit ❤️ pic.twitter.com/VFmyBEz7OT
— Bleacher Report (@BleacherReport) August 29, 2022
I am here for Serena and Olympia’s matching dresses. ❤️
— Christy Chirinos (@ChristyChirinos) August 29, 2022
The Serena style!! And Olympia with the matching outfit! All that glitters is gold tonight!! #USOpen
— Steve Weissman (@Steve_Weissman) August 29, 2022
— The Big Three (@Big3Tennis) August 29, 2022
Serena looks amazing in the night version of her outfit. Going out shining like the bright star she is. And she's moving so well! #USOpen2022
— Dallas! (@TheDallas) August 29, 2022
— Jenna Fink (@jennamfink) August 29, 2022
Serena Williams’ outfit tonight costs more than the prize money you get from winning the US Open.
— Bryan Tucker (@BTuckertime) August 29, 2022
serena and olympia literally matching omfg😭😭 this kit is so gorgeous pic.twitter.com/Af5C2k6EIz
— nabald | 22💜 (@andys_murray) August 29, 2022
Serena Williams offered raucous ovation at US Open
Williams entered the matcha against Kovinic with a deafening roar from the crowd.
Before the match, American Coco Gauff shared just how important Williams' influence has been on young athletes such as herself.
"Before Serena came along, there was not really an icon of the sport that looked like me.
"So growing up, I never thought that I was different because the No. 1 player in the world was somebody who looked like me.
"I think that's the biggest thing that I can take from what I've learned from Serena."
The 40-year-old won her 23rd major at the Australian Open in 2017, and looked all-but certain to eventually equal and pass Margaret Court's haul of 24.
The roar from the roof as Serena takes the court. Electric. pic.twitter.com/HW0QfcvSOm
— Andrew Catalon (@AndrewCatalon) August 29, 2022
But the American champion hasn't won a grand slam since, losing in four finals during that time.
Williams also owns 14 women's grand slam doubles titles with older sister Venus and has won four Olympic gold medals - one in singles (2012) and three in doubles (2000, 2008, 2012).
Click here to sign up to our newsletter for all the latest and breaking stories from Australia and around the world.