CREATE TABLE table_23789 ("Tournament" TEXT, "Also currently known as" TEXT, "City ( s ) " TEXT, "Country" TEXT, "Court surface" TEXT, "Tier IV in" TEXT, "Years" FLOAT)

What is the city location of the tournament currently known as the Medibank International Sydney?
SELECT "City(s)" FROM table_23789 WHERE "Also currently known as" = 'Medibank International Sydney'
SELECT "City(s)" FROM "table_23789" WHERE "Also currently known as" = 'Medibank International Sydney'