CREATE TABLE table_25958 ("Edition" TEXT, "Round" TEXT, "Date" TEXT, "Against" TEXT, "Surface" TEXT, "Opponent" TEXT, "Result" TEXT, "Outcome" TEXT)

If the opponent is Kristian Pless, who was it against?
SELECT "Against" FROM table_25958 WHERE "Opponent" = 'Kristian Pless'
SELECT "Against" FROM "table_25958" WHERE "Opponent" = 'Kristian Pless'