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Editor’s note: This story has been updated to reflect Osaka’s decision Monday to withdraw from the tournament.

Naomi Osaka is withdrawing from the French Open after the Grand Slams fined her $15,000 for declining to speak to the media after her first-round match.

Osaka announced her decision Monday in a lengthy Twitter post detailing her mental health battles. The 23-year-old tennis star said she’s a natural introvert and feels “huge waves of anxiety” when having to speak to the media after matches.

Osaka added that she apologized to the French Open organizers and offered to speak with them about improving the situation for players, press and fans.

Osaka was fined after skipping her post-match press conference following her straight-set win over Patricia Maria Tin on Sunday.

The move comes after Osaka announced that she would not be doing press at the tournament, citing mental health.

In a statement released by several Grand Slam tournaments, the federations warned of tougher disciplinary actions if Osaka continued her boycott.

“We have advised Naomi Osaka that should she continue to ignore her media obligations during the tournament, she would be exposing herself to possible further Code of Conduct infringement consequences,” the statement read.

Osaka’s withdrawal means her second-round opponent, Ana Bogdan, automatically advances.