SCHEMA:
CREATE TABLE table_name_48 (player VARCHAR, round VARCHAR, college_junior_club_team__league_ VARCHAR)
USER:
Which Player has a Round smaller than 4, and a College/junior/club team (league) of usa u-18?

QUERY:
SELECT player FROM table_name_48 WHERE round < 4 AND college_junior_club_team__league_ = "usa u-18"