Competing in the inaugural Big Bash League, the Sydney Sixers went on to win the tournament. After finishing third in the regular season games, the Sixers defeated the Hobart Hurricanes in the semi-final at Bellerive Oval. This facilitated a show-down with the Perth Scorchers in the final. They defeated the Scorchers on 28 January 2012, at the WACA Ground, thus becoming the inaugural champions of the Big Bash League.
As a result of their successful Big Bash League grand final win, the Sixers competed for the first time in the Champions League Twenty20 tournament. The tournament was held in October 2012 in South Africa. Again, the Sixers made history by winning this tournament on their first attempt. The Sixers were top of their group going into the finals of the tournament. They went on to defeat the Nashua Titans in the semi-finals and then the Highveld Lions in the final of the tournament to be crowned champions.
The Sydney Sixers were created when the decision was made to move away from state representative teams to city-based teams for the domestic Twenty20 competition. It is believed that this move was to align its structure with that of India and South Africa, where their domestic teams are based around cities. This was an important factor for the ongoing Champions League Twenty20 tournament, where those three nations were founding members. It was decided that there would be two teams from Sydney, two teams from Melbourne, and one from each other capital city for an eight team competition. The names Sixers (and Thunder for cross-city rivals) were decided upon by Cricket NSW. Other names considered for the two teams were Rocks and Edge. The Sixers won the 2011-12 inaugural Big Bash League, defeating the Perth Scorchers at the WACA Ground. The Sixers then went on to win the Champions League Twenty20 tournament in South Africa on their first attempt, when they defeated the Highveld Lions in the final.
The Sixers play in a magenta strip. While a spokesperson from Cricket NSW alluded that the team's colours may have some connection with the "Pink dollar" and Sydney Gay and Lesbian Mardi Gras, pink was ultimately chosen for reasons more related to McGrath Foundation, and to create a "really rock star, high-profile cricket team". Orange and yellow had also been considered for the Sixers and cross-town rivals, Sydney Thunder, but Cricket NSW believed these colours were too similar to that of the Western Australian cricket team, the Wests Tigers (NRL) and the GWS Giants (AFL). Magenta, therefore, gave a unique identity for the team and attempted to create a reflection of the competition which was "new and vibrant."
The Sydney Sixers play out of the Sydney Cricket Ground, Sydney. The stadium will have a capacity of 48,000 when the completion of redevelopments are set to finish in 2014 (in time for The Ashes series between Australia and England). Apart of the makeover includes new state-of-art facilities and grandstand as well as one of the biggest video screens in the southern hemisphere. The renovation is set to cost US$191 million.