CREATE TABLE table_73700 ("Outcome" CLOB, "Year" FLOAT, "Championship" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

When Australian open is the championship what is the lowest year?
SELECT MIN("Year") FROM table_73700 WHERE "Championship" = 'Australian Open'
SELECT MIN("Year") FROM "table_73700" WHERE "Championship" = 'Australian Open'