CREATE TABLE table_77241 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

How many years was the opponent petr korda?
SELECT COUNT("Year") FROM table_77241 WHERE "Opponent" = 'petr korda'
SELECT COUNT("Year") FROM "table_77241" WHERE "Opponent" = 'petr korda'