Mobile eSports are becoming a big deal. Last year, mobile MOBA Vainglory's big eSports tournament was backed by Amazon. Supercell put on a Clash Royale $1 million tournament last summer, too. Now China's Tencent Games is getting in on the action with plans for a series of eSport tournaments, beginning with the Arena of Valor World Cup in July of this year. The contest will take place in Los Angeles and offer a prize pool of more than $500,000, according to the press release.