NEW YORK >> After one errant forehand in the first set of the U.S. Open final, Naomi Osaka looked at her coach in the mostly empty Arthur Ashe Stadium stands with palms up, as if to say, “What the heck is happening?”

In response to another wayward forehand against Victoria Azarenka seconds later, Osaka chucked her racket. It spun a bit and rattled against the court.

Surprisingly off-kilter in the early going today, Osaka kept missing shots and digging herself a deficit. Until, suddenly, she lifted her game, and Azarenka couldn’t sustain her start. By the end, Osaka pulled away to a 1-6, 6-3, 6-3 victory for her second U.S. Open championship and third Grand Slam title overall.

“For me, I just thought,” said Osaka, who trailed by a set and a break, “it would be very embarrassing to lose this in an under an hour.”

This, then, is what she told herself with a white towel draped over her head at a changeover when things looked bleakest: “I just have to try as hard as I can and stop having a really bad attitude.”

It worked. A quarter-century had passed since a woman who lost the first set of a U.S. Open final wound up winning: In 1994, Arantxa Sanchez Vicario did it against Steffi Graf.

“I wasn’t really thinking about winning. I was just thinking about competing,” Osaka said. “Somehow, I ended up with the trophy.”

Osaka is a 22-year-old who was born in Japan to a Japanese mother and Haitian father; the family moved to the U.S. when she was 3.

Osaka, now based in California, arrived for the U.S. Open intent on claiming the championship, to be sure, but with another goal in mind, as well: continuing to be a voice for change by calling attention to racial injustice.

She showed up for today’s match wearing a mask with the name of Tamir Rice, a Black 12-year-old boy killed by police in Ohio in 2014. That was the seventh mask she’d used during the tournament, after honoring other Black victims of violence: Breonna Taylor, Elijah McClain, Trayvon Martin, Ahmaud Arbery, George Floyd and Philando Castile.

“The point,” Osaka explained, “is to make people start talking.”

Last month, Osaka refused to compete after the police shooting of a Black man, Jacob Blake, in Wisconsin — she said she would withdraw from her semifinal at the Western & Southern Open, although decided to play after the tournament took a full day off in solidarity.

Osaka and her coach, Wim Fissette — who used to work with Azarenka — have said they think the off-court activism has helped her energy and mindset in matches.

“I wanted,” Osaka said, “more people to (see) more names.”

So perhaps it was no coincidence that this win over Azarenka, a 31-year-old from Belarus also seeking a third Grand Slam title but first in 7½ years, made Osaka 11-0 since tennis resumed after its hiatus because of the COVID-19 outbreak.

Osaka added to her triumphs at the 2018 U.S. Open — earned with a brilliant performance in a memorably chaotic and controversial final against Serena Williams — and 2019 Australian Open.

Azarenka carried an 11-match winning streak of her own into today, including a stirring three-set victory over Williams in the semifinals, stopping the American’s bid for a 24th Grand Slam title.

Azarenka won the 2012 and 2013 Australian Opens and lost to Williams in the U.S. Open finals each of those years.

“I thought the third time was the charm,” Azarenka said, “but I guess I’ll have to try again.”

Even after Osaka surged ahead 4-1 in the third set, the outcome was unclear. Azarenka drew to 4-3, then stood and stretched during the ensuing changeover.

“Had a little bit of a energy dip,” Azarenka said.

Osaka regained control, then laid down on the court when the final was over.

The 23,000-plus seats in the main arena at Flushing Meadows were not entirely unclaimed, just mostly so — while fans were not allowed to attend because of the coronavirus pandemic, dozens of people who worked at the tournament attended — and the cavernous place was not entirely silent, just mostly so. One of the lucky few in the house: Osaka’s boyfriend, rapper YBN Cordae.

“I’m very grateful for the opportunity to play in front of millions of people watching on TV,” Azarenka said. “Unfortunately, they’re not here.”

Certainly no thunderous applause or the cacophony of yells that normally would reverberate over and over and over again through the course of a Grand Slam final, accompanying the players’ introductions or preceding the first point or after the greatest of shots.

Instead, a polite smattering of claps from several hands marked such moments.

Azarenka led early thanks to terrific returning and let-no-ball-by defense, stretching points until Osaka missed. And she repeatedly missed; the first set was over in a blink.

Azarenka broke early in the second set, too, to lead 2-0. The question shifted from “Who will win?” to “Might this be the most lopsided U.S. Open final?”

Except Osaka made subtle changes that altered the match. She stepped closer to the baseline, redirecting shots more immediately and forcefully. Azarenka began hitting the ball less stridently, making mistakes she avoided earlier.

Osaka went from producing merely five winners in the first set, to piling up 29 the rest of the way. And talk about cleaning up her act: She went from 13 unforced errors in the first set to only five in the second.

In the third, Azarenka was the unsettled one, double-faulting to set up break points, then netting a forehand to close a 17-stroke exchange to fall behind 3-1.

She would not go quietly, but it was Osaka who would take the title.

“I’m not necessarily disappointed,” Azarenka said. “It’s just painful. It’s painful to lose.”