The very first Super Smash Bros. 4 tournament took place on June 10, 2014, during E3 at the NOKIA Theater in Los Angeles, California. This somewhat wacky event was hosted by Nintendo themselves, and invited 16 of the franchise's best players to compete before the game had even released.
Though the tournament didn't necessarily follow the format that most Smash players are used to, it may have been the most important competition in the history of Super Smash Bros. 4. The event's winner, Gonzalo "TSM|ZeRo" Barrios, has stated before that had he not won that day, he would have quit Smash as a whole.
ZeRo is not single-handedly responsible for the evolution of Smash 4's competitive scene, however, the magnitude of his impact is undeniable. We certainly would not have seen anyone replicate the run that he has been able to create over the last few years.
As of right now, Barrios is the only player that has earned over $100,000 by playing Super Smash Bros. 4 -- which is nearly double that of the second highest earning player. This in a scene that does not have a "pro tour" directly supported by the creator company, like other fighting game scenes.
His 56-tournament win streak for the game is a feat that has been recorded in the Guinness Book of World Records, and he has won nearly every tournament, major or otherwise, in the years of 2014 and 2015.