CREATE TABLE table_25442 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Opponent in final" TEXT, "Score in final" TEXT)

What is the amount of US open runner-up score?
SELECT COUNT("Score in final") FROM table_25442 WHERE "Championship" = 'US Open' AND "Outcome" = 'Runner-up'
SELECT COUNT("Score in final") FROM "table_25442" WHERE "Championship" = 'US Open' AND "Outcome" = 'Runner-up'