1st of all, even when u start with 10% in all ur stats, u still have 70 more points to distribute, and u can freely redistribute all the points from and to any stat.
So I guess u tried the "hard" skill coz it was too easy in "medium" skill, right ?
So in "hard" skill, the real things begin !
This is the skill intended to be play by real good players, and I'm sure u are ..!
So, when u start in "hard", u have to do challenger tournaments, till u can win a few matches, then u'll get a few training points that will allow u to raise ur stats (most important are : form, fore hand or backhand, then service), then after u could go in better tournament and beat stronger opponents ..!
About Chile, Marcelo Rios was my favourite player since 7 years, so bad he had to stop his career coz of his back injury ...