CREATE TABLE table_name_55 (championship VARCHAR2, outcome VARCHAR2, opponents_in_final VARCHAR2)

What is Championship, when Outcome is 'runner-up', and when Opponents In Final is 'Gigi Fern ndez Natalia Zvereva'?
SELECT championship FROM table_name_55 WHERE outcome = "runner-up" AND opponents_in_final = "gigi fernández natalia zvereva"
SELECT "championship" FROM "table_name_55" WHERE "gigi fernández natalia zvereva" = "opponents_in_final" AND "outcome" = "runner-up"