CREATE TABLE table_name_18 (outcome VARCHAR2, surface VARCHAR2, partner VARCHAR2)

What was the outcome of the tournament with Akiko Yonemura as a partner on a hard surface?
SELECT outcome FROM table_name_18 WHERE surface = "hard" AND partner = "akiko yonemura"
SELECT "outcome" FROM "table_name_18" WHERE "akiko yonemura" = "partner" AND "hard" = "surface"