Changes Coming to League of Legends Competitive Format - GameSpot

The North American league will shift from a best-of-one to a best-of-three while the European league will shift to a best-of-two.
League of Legends is a multiplayer online battle arena game (MOBA). Players choose a role from an expanding cast of powerful champions and join forces in strategic, fast-paced gameplay to take control of the enemy’s end of the battlefield.

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