CREATE TABLE table_name_15 (opponents_in_final VARCHAR, date VARCHAR, outcome VARCHAR, surface VARCHAR)

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