CREATE TABLE table_16644 ("Edition" FLOAT, "Zone" TEXT, "Round" TEXT, "Date" TEXT, "Against" TEXT, "Surface" TEXT, "Opponent" TEXT, "Outcome" TEXT, "Result" TEXT)

Who did Tina Pisnik verse?
SELECT "Against" FROM table_16644 WHERE "Opponent" = 'Tina Pisnik'
SELECT "Against" FROM "table_16644" WHERE "Opponent" = 'Tina Pisnik'