CREATE TABLE table_25444 ("Outcome" CLOB, "Year" FLOAT, "Championship" CLOB, "Surface" CLOB, "Opponent in final" CLOB, "Score in final" CLOB)

How many championships have there been with Steffi Graf?
SELECT "Championship" FROM table_25444 WHERE "Opponent in final" = 'Steffi Graf'
SELECT "Championship" FROM "table_25444" WHERE "Opponent in final" = 'Steffi Graf'