Paragon
This third person MOBA from the developers at Epic Games already has a great following as it is currently free to play. At the time of writing this feature, there are 35 characters to play along with the promise from the developers that there will be a new hero added every three weeks. Paragon has a high potential to break into the esports scene with its largely undefined meta and third person perspective.
With this undefined meta, the door is wide open for pro players to play the game however they want to, giving a lot of variety of what could be done in the confines of the match. Being put on a big stage will allow the professional players to define the meta for a game, or make their own personal one, which will make matches hard to predict with the athletes trying out the options given to them by a totally new game.