Australian Open (6) เล่นบนพื้นผิวใด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
On what surface was the Australian Open (6) played on?It is not neccessary to use all the tables.
 table_29163303_1:  (surface [ VARCHAR ] championship [ VARCHAR) ]
SELECT surface FROM table_29163303_1 WHERE championship = "Australian Open (6)"