Dota 2 championship kicks off today with phase one of the playoffs – matches are best of three, with the losing team eliminated. The International finals kick off in full July 18 - 21 at the Seattle Key Arena, but matches are also streamed online. This year's International has a prize pool of more than $10 million, with $4.8 million reserved for the winning team.
Twitch has all of the live streams, or you can watch via the Dota 2 website. For uninitiated Dota 2 fans, there's a Newcomer's Broadcast that provides commentary aimed at helping new players and viewers understand what's going on.