CREATE TABLE table_26537 ("Edition" TEXT, "Round" TEXT, "Date" TEXT, "Against" TEXT, "Surface" TEXT, "Opponent" TEXT, "Win/Lose" TEXT, "Result" TEXT)

What is every surface against Sweden?
SELECT "Surface" FROM table_26537 WHERE "Against" = 'Sweden'
SELECT "Surface" FROM "table_26537" WHERE "Against" = 'Sweden'