MKLeo defeated ZeRo at the ZeRo Saga in order to claim his first victory at a major, and the final few seconds are documented here for all to see.
Unlike many Smash Bros. competitions, this one was for Super Smash Bros. for Wii U, and in the final MKLeo used Marth to devastating effect on the Duck Hunt map, sending a wounded Diddy Kong hurtling out the top of the map for the victory.
This is even more impressive when you consider how strong a force ZeRo is in the esports scene, and that MKLeo is just 15 years of age. Do you think the Super Smash Bros. for Wii U (or Smash 4) scene is as good as Melee?