การแข่งขัน Australian Open Tournament ปี 2011 มีกี่เซ็ต?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
How many sets were in the 2011 Australian Open Tournament?It is not neccessary to use all the tables.
 table_14542:  "Tournament" [ text]  "2007" [ text]  "2008" [ text]  "2009" [ text]  "2011" [ text]  "2012" [ text]  "2013" [ text] 
SELECT "2011" FROM table_14542 WHERE "Tournament" = 'australian open'