Serena Williams served up physical perfection in a periwinkle blue bikini.

In photos shared to Instagram Thursday, the tennis great posed in the two-piece — complete with a matching coverup with a thigh-high slit — while standing on the deck of a yacht, flaunting her toned legs and sculpted abs.

She ditched the skirt coverup in the second pic to reveal lavender bikini bottoms, and lounged on the side of the luxury boat in two additional snaps. She went with a natural makeup glam for the yacht outing.

In a pair of video clips, the highly decorated tennis legend soaked up the sun with her similarly clad guests on the vessel.

Via Instagram Stories, she credited stylist Lyndrea Imani with the nautical chic ensembles.

“Me and my girls… are out in the streets tonight,” the athlete captioned the carousel on Thursday. “But we starting here.”

Fans of the multi-time Wimbledon champ flooded to the comments thread to gush over the breezy summer vacation pics.

“Yall all look amazing! ❤️” wrote a follower, while another remarked, “Love the aesthetic!”

“‘In the streets’ for the tennis QUEEN means on a yacht in like the Mediterranean Sea. I love that for her 😂,” laughed a third.

“You are a goddess of the sea,” wrote a fourth, while yet another gushed, “Come on BLUE suit!!! Y’all cute!!!”

The mom of two and Olympic gold medalist, 43, previously took to Instagram to show off her rock hard abs during a gym workout session.

“Working out and working on my angles,” she captioned the post, which featured several post-workout snapshots, on Friday.

In an April interview, the retired sports icon confessed that “it’s weird now that I’m not necessarily playing professional sport.”

Still, she told Women’s Health, “fitness will always be a part of my life.”

“I think I view it the same,” she continued. “I try to be fit. I think the older you get, the more muscle you want—I know I do. Living a healthy life is so important for me.”

Williams — who showed off her toned legs during a viral crip walk performance at Kendrick Lamar’s Super Bowl Halftime Show — shares daughters Alexis Olympia, 7, and Adira River, 1, with husband Alexis Ohanian, 42.