It is called the RenGames Tournament of Champions. To qualify, winners from the 3 types of tournaments were chosen to challenge each other.
Racing, Rumbling, and Race 'n Rumble.
http://www.shadowprincess.com/toc1.html
First up was the Race 'n Rumble TOC. Only 2 teams were present, so the participants decided on the best 2 out of 3 rounds.
