Some tennis players aren’t very “Happy.”

For this year’s US Open, R&B star and murse aficionado Pharrell Williams teamed up with Adidas on a new, ’70s-style line of athletic apparel and accessories.

At first, the primary-color-covered, pinstripe-heavy collection was a hit among high-profile players.

But now, it’s acquired a rather undesirable distinction: It’s the unofficial uniform of first-week losers.

Fourth seed Alexander Zverev, who was favored to make it all the way to finals after he defeated Roger Federer at the Rogers Cup, was mocked for the Björn Borgy look, and went down early in Round 2.

Last’s year’s US Open winner Angelique Kerber was ousted in the first round while wearing the loud garb. Eighth seed Jo-Wilfried Tsonga lost to wild card Denis Shapovalov in Round 2. And sixth seed Dominic Thiem was upset by a resurgent Juan Martin del Potro during the fourth round.

Popular world No. 2 Simona Halep wore the line’s New York colorblock tank top and New York skirt to her Round 1 defeat by Maria Sharapova — who had just returned from a 15-month suspension. And this year’s Wimbledon champion, Garbiñe Muguruza, won’t be adding another slam to her résumé in 2017. (She favored the New York Climalite visor and Pharell Williams NY stripe dress)

Still, Williams’ becoming clothes are said to have been designed with not just aesthetics in mind, but athletics, too. They incorporate Climacool and Climachill fabrics to help regulate the players’ temperatures.

While the outfits themselves are surely not at fault, the coincidence is spooky.

“Whether you have seen it on social media or in person, everybody starts gravitating toward the bold colorblocking,” Alexander Chan, category director for Adidas Tennis, told Tennis Magazine.

Perhaps superstitious players should gravitate elsewhere.