CREATE TABLE table_9729 ("Tournament" CLOB, "Surface" CLOB, "Week" CLOB, "Winner" CLOB, "Finalist" CLOB, "Semi finalists" CLOB)

Which Surface has a Semi finalists of conchita mart nez arantxa s nchez?
SELECT "Surface" FROM table_9729 WHERE "Semi finalists" = 'conchita martínez arantxa sánchez'
SELECT "Surface" FROM "table_9729" WHERE "Semi finalists" = 'conchita martínez arantxa sánchez'