One of the biggest prize pools (if not the biggest) in gaming is Dota 2's The International and the record-breaking event is worth more than $18 million with the winning team taking home about a third of that.
The 16 teams in the competition are: Vici Gaming, Evil Geniuses, Team Secret, Invictus Gaming, LGD Gaming, Cloud9, Team Empire, Virtus Pro, comPlexity Gaming, Newbee, Fnatic, EHOME, Natus Vincere, CDEC Gaming, MVP Phoenix, and MVP.Hot6ix.
If you want to check out the action - head over to Dota2.com and you can also watch it via your Steam client.