CREATE TABLE table_34703 ("Date" TEXT, "Tournament" TEXT, "Location" TEXT, "Winner" TEXT, "Score" TEXT, "1st prize  (  $  ) " TEXT)

What is the 1st prize at the U.S. Open?
SELECT "1st prize ( $ )" FROM table_34703 WHERE "Tournament" = 'u.s. open'
SELECT "1st prize ( $ )" FROM "table_34703" WHERE "Tournament" = 'u.s. open'