Question: What tournament has Samantha Stosur as the opponent in the final?
SQL: SELECT "Tournament" FROM "2-1398079-3" WHERE "Opponent in the final" = 'Samantha Stosur';

Question: What date is the Zürich, Switzerland tournament?
SQL: SELECT "Date" FROM "2-1398079-3" WHERE "Tournament" = 'Zürich, Switzerland';

Question: What is the date of the Sydney, Australia tournament with a Hard surface?
SQL: SELECT "Date" FROM "2-1398079-3" WHERE "Surface" = 'Hard' AND "Tournament" = 'Sydney, Australia';