CREATE TABLE table_23523 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

Name the surface for australian open for winner
SELECT "Surface" FROM table_23523 WHERE "Championship" = 'Australian Open' AND "Outcome" = 'Winner'
SELECT "Surface" FROM "table_23523" WHERE "Championship" = 'Australian Open' AND "Outcome" = 'Winner'