CREATE TABLE table_name_48 (player VARCHAR, round VARCHAR, college_junior_club_team__league_ VARCHAR)

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