High Quality Content by WIKIPEDIA articles! The 2011–12 Sydney Sixers season was the club`s inaugural season in the Big Bash League (BBL) as the league adopted city-based teams rather than the traditional state representative team format of previous years. This was to align itself with the structure of the Indian Premier League for the ongoing Champions League Twenty20 competition. The Sixers were the inaugural champions of the Big Bash League, thus earning the right to compete in the 2012 Champions League Twenty20 in October 2012. The Sixers went on to win this tournament in their first effort.