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