CREATE TABLE table_4182 ("Outcome" CLOB, "Year" FLOAT, "Championship" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

On what surface was the Australian Open (6) played on?
SELECT "Surface" FROM table_4182 WHERE "Championship" = 'Australian Open (6)'
SELECT "Surface" FROM "table_4182" WHERE "Championship" = 'Australian Open (6)'