I think these are the highest guarantees in eSports currently? Not sure what League offers though.
Edit:
It looks like Heroes of the Storm (Blizzard) is $100K per team per year and League of Legends (Riot) is $12.5K per player per split. I'm not sure any other games have minimum salaries.
Venturebeat said:Being a professional gamer isn't easy. Your earnings often depend on how much you win, which is sometimes out of your control (especially in a team-based game). But Overwatch's ambitious esports project is guaranteeing players a salary with benefits. Blizzard released new details about the Overwatch League, its upcoming esports organization for its hit team-based shooter. Notably, Blizzard announced that professional players on Overwatch League teams will earn a minimum of $50,000 a year.
Source: https://venturebeat.com/2017/07/26/...watch-league-players-at-least-50000-per-year/Overwatch League players will receive health insurance and retirement savings plans. Also, 50 percent of all performance-based bonuses (winnings from playoffs and special events) must go to a team's players. Total available bonuses in the first season will amount to $3.5 million.
Edit:
It looks like Heroes of the Storm (Blizzard) is $100K per team per year and League of Legends (Riot) is $12.5K per player per split. I'm not sure any other games have minimum salaries.