CREATE TABLE table_name_55 (championship VARCHAR(255), outcome VARCHAR(255), opponents_in_final VARCHAR(255))
What is Championship, when Outcome is "runner-up", and when Opponents In Final is "Gigi Fernández Natalia Zvereva"?
    
SQL: SELECT championship FROM table_name_55 WHERE outcome = "runner-up" AND opponents_in_final = "gigi fernández natalia zvereva"