Your son's school grades, SSAT and TOEFL scores are decent. I am pleased that he likes sports which is a plus when applying to U.S. schools especially if he is particularly good at the sports or extra curricular activities. Most people will quote you admissions standards of certain schools but those are only for reference only. There are many criteria which the school considers and if you are serious about sending your son to the U.S., I strongly suggest that you apply to a handful of schools that are suitable for your son. Good luck!