CREATE TABLE table_8539 ("Tournament" TEXT, "Surface" TEXT, "Week" TEXT, "Winner and score" TEXT, "Finalist" TEXT, "Semifinalists" TEXT)

Which Semifinalist has a Tournament of stockholm?
SELECT "Semifinalists" FROM table_8539 WHERE "Tournament" = 'stockholm'
SELECT "Semifinalists" FROM "table_8539" WHERE "Tournament" = 'stockholm'