In June, the 23-year-old who will be representing Japan in the upcoming Tokyo Olympics, withdrew from the French Open after being fined by the tournament for not giving interviews.
She said her decision had been made with her mental health in mind.
Since then she launched a reality show and appeared on magazine covers, including Vogue and Sports Illustrated, which seemingly prompted Kelly to tweet about the athlete’s media appearances.
The conversation began on Monday, after conservative commentator Clay Travis tweeted: “Since saying she’s too introverted to talk to the media after tennis matches, Naomi Osaka has launched a reality show, a Barbie, and now is on the cover of the SI swimsuit issue."
Kelly retweeted the statement and added: “Let’s not forget the cover of (& interview in) Vogue Japan and Time Mag!”
In response to Kelly, Osaka replied in a since-deleted tweet telling the journalist to “do better,” after revealing that the magazine covers were shot before she spoke publicly about her mental health struggles.
According to a screenshot which was captured by Sporting News, she said: “Seeing as you’re a journalist I would’ve assumed you would take the time to research what the lead times are for magazines.
“If you did that you would’ve found out that I shot all of my covers last year.
“Instead your first reaction is to hop on here and spew negativity, do better Megan (sic)”
The tennis pro’s response prompted another response from Kelly, who accused Osaka of only being tough “on the courts,” while revealing with a screenshot that Osaka had blocked her on Twitter.
She said: “Poor @naomiosaka blocked me while taking a shot at me (guess she’s only tough on the courts).
"She is apparently arguing that she shot her many covers b/4 publicly claiming she was too socially anxious to deal w/press (sic) "
The exchange also prompted Piers Morgan to get involved, with the TV presenter seemingly siding with Kelly when he tweeted: “The only media Ms Osaka wants to tolerate are sycophantic magazine editors telling her how perfect she is.”
In the same tweet, Morgan also revealed that he had also been blocked by the four-time Grand Slam singles champion on Twitter.