CREATE TABLE table_37559 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

Which Partner has a Tournament of catella swedish open?
SELECT "Partner" FROM table_37559 WHERE "Tournament" = 'catella swedish open'
SELECT "Partner" FROM "table_37559" WHERE "Tournament" = 'catella swedish open'