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

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