ESL has launched an esports league for amateur mobile gamers. ESL Mobile Open enables amateur gamers in the United States to compete at stadium events on the same stage as professional esports athletes. The year-round league, supported by founding sponsor AT&T Inc. (NYSE: T), will rotate among the most popular mobile game titles over the course of three seasons annually. The inaugural season kicks off next week, on March 18-19, with “PlayerUnknown’s Battlegrounds Mobile” (“PUBG Mobile”),…