CREATE TABLE table_204_562 (id DECIMAL, "no." DECIMAL, "date" TEXT, "location" TEXT, "surface" TEXT, "opponent in final" TEXT, "score" TEXT)

how many times did camerin oppose maria sharapova in singles finals ?
SELECT COUNT(*) FROM table_204_562 WHERE "opponent in final" = 'maria sharapova'
SELECT COUNT(*) FROM "table_204_562" WHERE "opponent in final" = 'maria sharapova'