CREATE TABLE table_9730 ("Tournament" TEXT, "Surface" TEXT, "Week" TEXT, "Winner" TEXT, "Finalist" TEXT, "Semi finalists" TEXT)

Which Tournament has a Semi finalists of mary pierce elena dementieva?
SELECT "Tournament" FROM table_9730 WHERE "Semi finalists" = 'mary pierce elena dementieva'
SELECT "Tournament" FROM "table_9730" WHERE "Semi finalists" = 'mary pierce elena dementieva'