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

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'