We went status-symbol spotting at the US Open. Here's what we found.

US Open attendees made statements with high-end accessories and designer pieces.

Daniel Edward Photography for BI

Tennis fans are serving at this year’s US Open. We’re talking about their fashion, of course.

Attendees have been photographed walking throughout the USTA Billie Jean King National Tennis Center in New York for the past two weeks, wearing standout ensembles and luxury timepieces.

Here are the best fashion looks we spotted on the ground.

Bulgari watches are elevating simple outfits.

An attendee wearing a white tank top and satin silver pants took her outfit to the next level with a Serpenti Tubogas watch, which costs upward of $7,400.

Blue jeans are out, and white jeans are in.

A couple wore matching pairs with their Ralph Lauren shirts and baseball caps. They both also wore white sneakers.

Blue denim dresses and accessories are popular, though.

One attendee wore a denim dress and carried a denim tote, pairing the look with Adidas sneakers.

Her companion wore Nike sneakers with his trousers and blazer, keeping the look casual.

Alo continues to be the go-to athletic brand.

A woman wore the brand’s sports bra and miniskirt set beneath a white letterman jacket, also from the brand.

Monochrome outfits are everywhere.

Another couple sported matching black outfits with standout accessories. A woman wore hers with white flats, while a man wore his version of the outfit with a colorful scarf.

Women are pairing their miniskirts with polo shirts.

One woman wore her white miniskirt with a matching polo top, see-through flats, and a statement gold belt. She also wore metallic jewelry, sunglasses, and a Staud purse.

You can't go wrong with US Open merchandise.

That’s especially true when it comes to baseball caps, which one man wore with a cream-colored top, plaid pants, and white sneakers.

There's no better place to flash a Rolex.

Specifically, the GMT-Master II in stainless steel and yellow gold was the watch of choice for one attendee. The watch sells on the secondhand market for more than $11,000.

The simpler your Rolex, the better.

Alongside an arm covered in gold jewelry, one attendee wore a silver Oyster Perpetual 31 watch, which costs $6,300.

Couples are coordinating their outfits.

One duo wore statement white tops with oversize black trousers and leather shoes. Layered jewelry also played a part in both of their looks.

The baseball cap of choice comes from Celine.

Multiple people were spotted wearing a $630 tan hat with Celine’s monogram across the front. One woman wore hers with a white miniskirt and a Chanel purse.

Strappy flats and Louis Vuitton bags are the accessories of choice.

With a green miniskirt and matching sweater, one woman wore black flats that laced up her ankles. She completed the look with a small Louis Vuitton purse that featured the brand’s monogram in rainbow colors.

Trader Joe's tote bags have made their way to the US Open.

One man carried the standard version of the buzzy grocery bag, adding a trendy touch to his classic outfit: a pink polo shirt, tan jeans, tortoise-shell sunglasses, and cream-colored sneakers.

The US Open is the place to show off Patek Philippe watches.

One man wore a $71,643 World Time Flyback Chronograph timepiece with a steel dial and a brown leather bracelet.

The same goes for Vacheron Constantin timepieces.

An Overseas Chronograph in steel was spotted at the US Open. The watch, which sells for more than $37,000, had a black leather strap and a stainless steel bezel.

Neutral shades and baby blue are having a moment.

Tan sets are especially popular right now. One man wore his with a white T-shirt and a brown belt. You might also spot tons of baby-blue polos. A woman sported a tiered version of the top over a ruffled skirt.

Both attendees completed their looks with dark sunglasses and sneakers.

Tiny Hermès belts are making big statements.

The $735 belts are often extremely thin with delicate, gold H-shaped buckles — so you might miss them. One attendee wore hers with a black skirt, white tank top, tan flats, and a plum-colored sweater tied around her shoulders.

Scarves are being worn as belts and bag accessories.

A woman at the sporting event tied a colorful scarf around the handles of her yellow Prada purse, adding a contrast of color to her tan skirt, white sweater, and red top.

Polo Ralph Lauren, one of the event's sponsors, is also a fashion status symbol.

Attendees have been photographed wearing everything from the brand’s hats to its jackets and polo shirts. Some have even worn multiple at the same time.

Some attendees have added Polo sweaters over their shoulders to elevate their looks.

A sweater on the shoulders adds a preppy twist to a US Open look. One group chose Polo sweaters with green-trimmed sleeves, adding a pop of color to their looks.

Accessories are also taking sweaters to the next level.