The Evolution Championship Series, commonly known as Evo, is an American annual esports event that focuses exclusively on fighting games. The tournaments are completely open and use the double elimination format. As with Super Battle Opera, contestants travel from all over the world to participate, most notably from Japan. The first Evolution was originally held as a Super Street Fighter II Turbo and Street Fighter Alpha 2 tournament called the Battle by the Bay. It changed its name to Evo in 2002. Every successive tournament has seen an increase of attendees. It has been held at various venues across the Las Vegas Valley since 2005. As of 2021, the event is jointly owned by Sony Interactive Entertainment and the Endeavor esports venture RTS.

Esports, short for electronic sports, is a form of competition using video games. Esports often takes the form of organized, multiplayer video game competitions, particularly between professional players, played individually or as teams.