Osaka, who has won the last two grand slams to reach No.1 in the world, has career earnings of $US10.8 million ($15m) and millions more in endorsements.
Jean says he signed a contract that would pay him a share of Osaka’s future earnings as her family were unable to pay the going rate for coaching.
Asked about the lawsuit Osaka, who grew up less than five kilometres from Hard Rock Stadium, the new home of the Miami Open, said: «I’m not allowed to say anything. I am unable to make a comment.»
Spiro, however, said Jean was an opportunist looking to cash in.
«While it comes as no surprise that Naomi’s meteoric rise as an international icon and inspiration would lead to some false claim, this silly «contract» that Naomi never saw or signed — which purports to give away part of herself at the age of 14 — is particularly absurd,» Spiro said in an email.