Re: When does a player turn pro?
It's the same like in all other sports: you turn pro the moment your sport is the only way of income you have. Then your sport is your main profession.
In Belgium most players turn pro, the moment they finish school (age of 18) and give tennis a full shot. There are soms exceptions for the big talents who turn pro earlier (Malisse, Clijsters, Henin, Rochus,...).