Table schema:
CREATE TABLE table_name_15 (opponents_in_final VARCHAR, date VARCHAR, outcome VARCHAR, surface VARCHAR)

Question: Which Opponents in Final has an Outcome of winner, and a Surface of hard, and a Date of april 17, 1994?
SQL: SELECT opponents_in_final FROM table_name_15 WHERE outcome = "winner" AND surface = "hard" AND date = "april 17, 1994"