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

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