Tennis star Naomi Osaka was fined $15,000 Sunday for refusing to attend a post-match press conference during the French Open, and has been warned that she will face further consequences if she continues to do so.

While Osaka had a successful start to the tournament, she said previously that she would skip mandatory post-match media briefings during the French Open. Under the rules, Osaka must still meet with the media for post-match news conferences upon request, reports AP.

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