CREATE TABLE table_name_48 (player VARCHAR(255), round VARCHAR(255), college_junior_club_team__league_ VARCHAR(255))
Which Player has a Round smaller than 4, and a College/junior/club team (league) of usa u-18?
    
SQL: SELECT player FROM table_name_48 WHERE round < 4 AND college_junior_club_team__league_ = "usa u-18"