CREATE TABLE table_43897 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

What is the highest year for the US Open?
SELECT MAX("Year") FROM table_43897 WHERE "Championship" = 'us open'
SELECT MAX("Year") FROM "table_43897" WHERE "Championship" = 'us open'