CREATE TABLE table_name_9 (surface VARCHAR, semi_finalists VARCHAR)

Which Surface has a Semi finalists of conchita mart nez arantxa s nchez?
SELECT surface FROM table_name_9 WHERE semi_finalists = "conchita martínez arantxa sánchez"
SELECT "surface" FROM "table_name_9" WHERE "conchita martínez arantxa sánchez" = "semi_finalists"