They’re serving high fashion!

Trendsetters are turning the US Open into an upscale preppy runway complete with tennis-themed heels, chic designer dresses and neon-green manicures — with one fan confessing, “I’m just here for the fashion.”

The stylish set is giving the Kentucky Derby a run for its money by dressing to the nines — some in   $15,000 outfits — and hoping to be seen everywhere from social media to TV land.

“I don’t care about tennis. I’m just here for the fashion. There’s really great outfits,” Elena Miglino, a 38-year-old makeup artist, told The Post Thursday night.

“I think I’ll post on social media. Maybe I’ll make a funny TikTok,” said Miglino, a former reality TV contestant from “Paris Hilton’s My New BFF.”

Emma Goodwyn, 27, a stay-at-home mom of two from Tennessee, strutted into Arthur Ashe Stadium sporting a white tennis skirt and homemade high heels with tennis balls spiked through the back.

“My husband loves tennis. I married into a tennis family, so I decided I love tennis clothes — that is my angle,” the Nashville resident said.

Her heels were inspired by the sporty-chic look Zendaya rocked while promoting the sexy tennis flick “Challengers” last year, she said.

Other fashionistas put their own unique spin on the court-side couture.

“This year I decided to do an actual play on the tennis ball,” said Nichole Schier, a banker from West Orange, NJ,  who wore a Kate Spade tennis ball-shaped purse with matching neon-green nail polish.

“I go for the tennis but I am all about the fashion,” said Schier, who also rocked a fitted white skirt, a  fedora with a tennis ball scarf and a bracelet that read “US Open.”

“I just love to just have a little bit of fun; it’s nice to have people spot me and say, ‘You look great.’”

Stadium revelers sported shirts tied around their necks, Ralph Lauren polos and expensive loafers, with some plunking down big bucks to look stylish at the event.

Alexander Hahn, 33, of Dallas, was decked out in Gucci socks, a Lacoste button-up, a $12,000 Rolex watch and a custom-made tennis ring from Florence, Italy — an outfit he estimated cost about $15,000.

“It’s a major tournament, so we got a little more polished up,” he said of himself and his wife, Sierra, who appeared on the tournament’s “kiss cam.”

“[We did it] just for the sake of coming and dressing up, it’s a part of it.”

Tennis buff Samuel Phillips, 23, looked slick in white linen pants, a baby blue Adidas polo and white Stan Smith shoes.

“I knew this was an event where the fashion came to play with the fans,” he said.

“I was like, ‘OK, I gotta put on my A game.’”