PARIS, AFP: World number two Naomi Osaka let her racquet do the talking at the French Open on Sunday, maintaining her media boycott but briefly telling a TV interviewer that her claycourt game is “a work in progress”.

Osaka opened the first day of action at Roland Garros with a 6-4, 7-6 (7/4) victory over Romanian world number 63 Patricia Maria Tig.

The 23-year-old Japanese star, a four-time Grand Slam title winner, has refused to carry out media obligations at the tournament, claiming news conferences are detrimental to her mental health.

She believes traditional post-match inquests are akin to “kicking people when they're down”.

French Tennis Federation President Gilles Moretton, however, described Osaka's move as a “phenomenal error”.

On Sunday, Osaka only agreed to take part in a cursory on-court television interview but still faces a fine of up to $ 20,000 for skipping mandatory news conferences.

Osaka, who has never got past the third round in Paris, fired 39 winners but committed 35 unforced errors against Tig to set up a second-round duel against another Romanian player Ana Bogdan.

Three-time major winner Angelique Kerber, the German 26th seed, fell at the first hurdle, losing to Ukrainian qualifier Anhelina Kalinina 6-2, 6-4.

The win was a 14th successive win for the world number 139 Kalinina across all tournaments.

Kerber knocked out at Roland Garros