I will let someone correct me if I am wrong, BUT the WSYL eligibility rules USED to require each U.S. player to have just finished 7th grade. I just checked that that is NO longer a requirement.
In addition, the rule on having to be a "real" member of the team now has the following guidance: "Minimum requirements are that players must compete with their team/program for at least two other tournaments or in a seasonal league. These events do not need to precede the qualifier but must precede the Championship event."
