Japanese superstar Naomi Osaka Naomi Osaka was fined $15,000 by tennis' Grand Slam organizers on Sunday and warned of possible ejection from the French Open and suspension from future majors after the world number two skipped a news conference after her opening win at Roland Garros.

The 23-year-old, a four-time Grand Slam winner, cited the impact on players' mental well-being for her decision ahead of the claycourt major not to hold news conferences, saying the nature of questions from journalists is like "kicking a person when they are down".

Osaka started her French Open campaign with a win over Romanian Patricia Maria Tig 6-4 7-6(4) and then boycotted the post-match news conference, although she did hold a court-side interview immediately after the game.

(With input from agencies)