Whether his assertion is literally true or not is immaterial. If Mouratglou wants to remain as Serena’s coach this assertion is the absolutely wrong thing to utter. It is true in general terms that if one does not toot one’s horn a disinterested person will not do it for you. But it is a different kettle of fish in an employer employee relationship, No employer would take kindly to any employee who suggests that if it was wasn’t for him/her the employer would not be as successful. If the employee wishes to remain in employment he/she must be content with any praise the employer deigns to lavish. Of course once the employee is no longer in the employ of the employer he/she is free to assert all the accomplishments he/she effected during the said employment. Alas in such cases no disinterested person would be interested.