INDIAN WELLS, Calif. — Camila Osorio defeated former champion Naomi Osaka 6-4, 6-4 in the first round at Indian Wells on Wednesday night, becoming the first Colombian woman to beat a former world No. 1.

Osaka, a four-time Grand Slam champion, never looked comfortable against Osorio’s dynamic shotmaking and piled up unforced errors on a cool evening in the California desert.

After a near flawless first set from Osorio, Osaka fended off a match point at 5-3 in the second to stay alive, much to the delight of the fans.

Nerves appeared to get to Osorio as she attempted to serve out the match in the next game, where she double faulted twice and fell behind 40-0.

She regrouped, however, saving four break points in the game and crushing a forehand winner that caught the line to advance, celebrating with a dance on the court under the lights.

“First, good evening, everyone, I’m Camila Osorio,” she said with a laugh in an on-court interview. “It’s crazy for me, it’s a dream come true. I really wanted to play on this court and was really excited and looking forward to playing a champion like Naomi, so I can’t believe it.”

Osorio, the world No. 53, takes on 22-seed Clara Tauson of Denmark in the second round of the BNP Paribas Open.

It was Osaka’s first match since withdrawing from the Australian Open third round because of an abdominal strain.

Osaka, who beat Daria Kasatkina in the Indian Wells final in 2018 for her first career title, appeared to struggle with the consistency of her ball tosses and accuracy off both wings.

Reuters contributed to this report.