StarCraft II Proleague, also known as StarCraft Proleague or Proleague for short, is the longest running StarCraft league in the world and the most prestigious team league. Hosted by the Korean eSports Association (KeSPA), the league is played offline in South Korea. Proleague began in 2003 with the game StarCraft: Brood War before switching over to StarCraft II in 2011. It is currently broadcast by SPOTVGames.

History

In 2003, the game broadcasting company MBCGame created the KPGA Team League, the first major team league in StarCraft professional competition. MBCGame's competitor, OnGameNet created their own team league in response and so two major team leagues were active in the early 2000s.

In 2005, KeSPA merged the two team leagues to create the Proleague, a unified league.SK Telecom T1 swept the first two rounds of the newly formed league and ended up winning the grand finals as well to be the first champion. From its inception, the Proleague format had the teams alternate between 1vs1 and 2vs2 games in a best of five or best of seven match. However, the 2vs2 matches were discontinued in 2008, leaving only 1vs1 games. After the 2008 season, the format of Proleague changed again to span a longer portion of the year, typically starting from the end of one year and ending in the Fall of the next. The 2009 - 2010 season led to the creation of the modern Proleague format where teams face off each other in four or five rounds of round robin. At the end of the season, the highest scoring teams face off in a single-elimination playoffs bracket to determine the champion.