Serena Williams Serves a Style Grand Slam in Statement Nike Sneakers and 2026's Biggest Color Trend

Serena Williams attended a 2026 US Open event in the cobalt blue color trend and Nike sneakers.

From a fashion-insider POV, Fall 2026 runway shows inspired Serena Williams to sample the cobalt blue color trend on August 27. But bear in mind that the tennis legend has been practicing for the 2026 US Open all week—on cobalt-colored courts. Perhaps the electric shade was Williams's way of representing tennis-core at a pre-US Open pickleball tournament.

One week before her first doubles match with her sister, Venus Williams, Serena traded her racquet for a paddle at New York City's ninth annual Palace Invitational. The athlete—with six US Open trophies to her name—didn't just win the tournament: Her look was the clear champion, too.

Serena Williams walked the red carpet in Nike's take on the cobalt blue color trend. (Image credit: Ryan Northrop)

Sourcing her entire outfit from Nike, the global brand ambassador wore a butter-yellow mini skirt, a blue track jacket over a peekaboo bra, and matching "Book 2 'JB'" sneakers. While the Loose Coaches Jacket is still available for $90, her quilted high-top basketball trainers launched less than a month ago, making them a hot ticket item for athletes and sneakerheads alike.

Always on board for a statement-making shade (especially during a tennis tournament), Williams has history with cobalt blue. Long before Dua Lipa, Jessie Buckley, and Anne Hathaway fell for the bold pigment, she wore it during the 2009 Australian Open. In fact, her outfit was not a far cry from her latest pickleball look: Back then, she similarly accessorized with butter-yellow head and wrist bands from Nike.

Almost two decades ago, Williams wore the same color trend at the Australian Open. (Image credit: Getty Images)

That's not to say Williams reserves the color for sporting events only. Two years ago, the style setter's cobalt-tinted fur coat turned heads in Balenciaga's Fall 2024 front row. Layering a black column dress beneath its fuzzy finish made the not-quite-indigo, not-quite-sapphire shade really shine.

Williams wore a cobalt blue coat at a Balenciaga show, too. (Image credit: Getty Images)

Fast forward to the 2025 Super Bowl Halftime Show, and Williams reunited with the hue. Nike custom-made a blue cropped bomber jacket and pleated tennis skirt for the Grand Slam champion, who stole the show during Kendrick Lamar's "Not Like Us."

Williams even gave the color a close-up at the 2025 Super Bowl. (Image credit: Getty Images)

Clearly, I was wrong: Williams wasn't influenced by Chanel, Chloé, Givenchy, Saint Laurent, and more. If anything, she became their blueprint.

At Chloé's Fall 2026 show, the same color emerged from beneath a plaid, mossy green cape.

A model wore the cobalt blue trend on the Chloé Fall 2026 runway. (Image credit: Launchmetrics)

Meanwhile, Chanel's new creative director, Matthieu Blazy, sculpted a '20s-era, drop-waist dress out of bright blue tweed. The color peeked through from atop the corresponding jacket's supersized buttons.

Cobalt blue looks resurfaced on Chanel's catwalk. (Image credit: Launchmetrics)

Mugler boarded the cobalt blue bandwagon as well. The Fall 2026 show took a vibrant turn once an asymmetrical coat dress walked the runway. Its glossy satin sheen made the already striking shade even more memorable.

Cobalt blue was the star of Mugler's Fall 2026 show. (Image credit: Launchmetrics)

For Williams, cobalt blue isn't just this year's biggest trend—it's a recurring color story in her fashion archives. To test the anti-sky blue shade the Serena Williams Way, shop the sporty-chic athleisure looks from Adidas, Nike, Vuori, and more below.

Shop the Cobalt Blue Color Trend Inspired by Serena Williams