MELBOURNE, Australia — Moments after her Grand Slam comeback ended in a first-round loss, Naomi Osaka walked back through the players’ tunnel where her name has a prominent place among recent Australian Open champions.

Three matches into her return from 15 months off the tour, and six months after the birth of her daughter, Shai, Osaka lost 6-4, 7-6 (2) to 16th-seeded Caroline Garcia in a tight encounter at Rod Laver Arena on Monday night.

“The competitive in me is really frustrated that I’m not winning these matches, of course,” Osaka told a post-match news conference. “So I wouldn’t say, like, this comeback is how I thought because I’m delusional enough to think I could have won the tournament.”

She smiled, before adding: “I think my delusion is what allows me to win the tournaments.”

Osaka won the U.S. Open in 2018 and 2020, and the Australian title in 2019 and ’21. This was the first time she lost in the first round in Melbourne, where she made her debut in 2016.

She took time out from tennis for her own wellbeing after first-round exits at the French Open and U.S. Open in 2022. She’s not planning any more breaks for now.

“Yeah, I think I just have to keep living day by day and training hard and playing a lot more matches,” she said. “And hopefully my dreams will come true.”

The big-serving Garcia didn’t give Osaka a look at a break point in the match. Most of the rallies were short — only three longer than nine shots. The bulk were less than four. Most of the service holds were comfortable — except for Osaka’s one dropped game in the first set. That was all the difference.

“I have a lot of respect for Naomi as a person and as a player — 15 months she’s been away,” Garcia said. “I’m very glad to see her back. Six months after giving birth, she’s playing quite amazing already. We have to watch out.”

Osaka was one of three past Australian Open champions who returned to play at Melbourne Park for the first time as moms, joining 2016 winner Angelique Kerber and 2018 champion Caroline Wozniacki.

The Australian Open started Sunday and will be played over 15 days for the first time, with the first round spread over three days in a bid to cut down on the late-finishing matches.

Still, it was 1:39 a.m. local time by the time Felix Auger-Aliassime closed out a 4-hour, 59-minute win over 2020 U.S. Open winner Dominic Thiem that finished 6-3, 7-5, 6-7 (5), 5-7, 6-3. That match was briefly held up in the fourth set by a bird landing on the court at Margaret Court Arena and having to be chased off by a ball kid to laughter from the crowd. It then flew around the stadium briefly before play could continue.

For Auger-Aliassime, the win ended a run of first-round exits at three consecutive majors.

In the opening match on Rod Laver, U.S. Open champion Coco Gauff needed just 60 minutes to advance 6-3, 6-0 over Anna Karolina Schmiedlova.

The 19-year-old Gauff, who won her first major at the U.S. Open in September, said she had increased confidence in her serve thanks to some advice from Andy Roddick.

Fourth-seeded Gauff dropped just one point on her serve in the second set and credited Roddick, saying “he’s probably one of the best servers in history.”

Wimbledon champion Marketa Vondrousova didn’t make it past the first round, losing 6-1, 6-2 to Dayana Yastremska and struggling with a hip injury.

A third 16-year-old reached the second round, with Mirra Andreeva beating 29-year-old Bernarda Pera 7-5, 6-2 to set up a second-round match with sixth-seeded Ons Jabeur, a three-time runner-up at Grand Slams.