CREATE TABLE table_14542 ("Tournament" TEXT, "2007" TEXT, "2008" TEXT, "2009" TEXT, "2011" TEXT, "2012" TEXT, "2013" TEXT)

How many sets were in the 2011 Australian Open Tournament?
SELECT "2011" FROM table_14542 WHERE "Tournament" = 'australian open'
SELECT "2011" FROM "table_14542" WHERE "Tournament" = 'australian open'