Naomi Osaka returned to the U.S. Open stage in style — in more ways than one.

The former World No. 1 not only competed in her first match in Flushing in two years, but Osaka also looked dominant at times on her way to defeating the 10th-seeded Jelena Ostapenko of Latvia 6-3, 6-2 on Tuesday inside Louis Armstrong Stadium to pick up her first top-10 victory in four years.

It was Osaka’s first match on the Billie Jean King National Tennis Center grounds since she gave birth to her daughter, Shai, 13 months ago — and the 26-year-old was overcome with emotion when it was over.

Sitting on her bench as the crowd roared around her, Osaka wept, holding her face in her towel at points.

“It’s a combination of a lot of different things,” said Osaka, who will face Czechia’s Karolina Muchova on Thursday. “I grew up here, so just seeing kids — and then remembering my daughter — but just seeing kids coming and watching me play. Just remembering that I was a kid — I guess a long time ago — made me very emotional.

“And then also just remembering that I came and watched Coco [Gauff] play her semis [at the Open last year] and I was in the audience and I didn’t know if I was going to be able to play again at this level. Just to play Ostapenko, who’s such a great player, and win that match means a lot to me.”

Osaka — who grew up in Elmont and learned to play on the courts in Jamaica, Queens, after her family moved to the U.S. when she was 3 and before relocating to Florida when she was 8 — committed zero unforced errors in the first set while leaning on her strong serving game. After scoring the lone break of the opening set to establish herself, Osaka — sporting a striking bright green ensemble covered in bows and ruffles — maintained pressure on Ostapenko for the remainder of the match.

Serving up nine aces in comparison to Ostapenko’s five, Osaka also benefited from her opponent’s six double-faults.

Ostapenko opened up the last game with a 40-15 lead, but Osaka saved both break points, before staying the course to convert on her third match point and secure the win in 63 minutes.

It’s been an arduous road to get back to the level Osaka is now. A wild card in this tournament and world No. 88, Osaka entered the U.S. Open without much play under her belt.

Since returning to the Tour after a 15-month maternity leave, the four-time major champion and two-time Open winner had posted a 16-15 record. Despite a fourth-round finish in Rome and a quarterfinal appearance in Doha, Osaka has yet to surpass the second round at a major this year.

She also lost in the second round of the National Bank Open and failed to qualify for the Cincinnati Open’s main draw. Following that three-set loss to American Ashlyn Krueger, Osaka opened up on social media about dealing with possible symptoms of postpartum depression.

“This court is my home,” Osaka said when asked to compare Tuesday’s match to the rest. “It gives me so much more confidence. I step on the court knowing that I probably have the most wins in the field maybe. Having two wins here means a lot, and I think, for me, I’ve been struggling with confidence throughout the year.

“And this time now forces me to look in the mirror and say, ‘Hey, you’ve done really well here, there’s no reason why you can’t do well again.’ I just tried to channel that today.”

That she did, all while making perhaps the most notable fashion statement of the tournament.

To Osaka, her Ambush x Nike custom-made outfit — the day version of the “Lolita goth” dress she previewed before the tournament — is like a super suit.

“I do remember thinking, ‘I need to win this match so I can wear my other color,’” Osaka said with a giggle. “That was very important to me. Yeah, I guess you’ll see my other color next time.”