Supersonic Acrobatic Rocket Powered Battle-Cars was released on October 9, 2008 in the United States on the Playstation 3. Shortly thereafter the Psyonix forums became the focus of competitions and small organized matches. Many players would have communicated when they would have been on 1v1 or 2v2, as they were more easily organized. According to Wikipedia, the game was downloaded for a total of 2 million times out of the Playstation network, and with the release of the game in Europe, the game gained some traction as some players wanted to see a much more panorama competitive.
Gibbs has been extremely active in the community for about the first year of release in the United States, also keeping an eye on a variety of players and trying to keep records and a classification system together. At one point it became too much and had to abandon that responsibility Rocket League Items, but the seed was sown for a more serious tournament. A tournament that tracks player improvements and, using certain metrics, classifies them externally from the game.
SARPBC has an internal ELO system, and it was this system that was used to determine the first seedings of the first major tournament that was formed. Spurred by the players, Fenrir12 created a post to ask for votes on what would have been his first foray into the competitive scene. At the end 2v2 won, so Duality was born. "2v2 team games" was "sarpbc for the vast majority of life span", Fenrir informs, suggesting that he was not surprised by the result of that first result. Nowadays the forum post has been updated to show the end of the tournament and the images have disappeared from the page.