Korean player Geguri is an up-and-coming Zarya player with an earth shattering KDA of 6.31 and a win rate of about 80% after 420+ games. She is SO good in fact that her performance has been attributed to cheating on several occasions.
Two pros are even reported as betting that if she weren't a hacker they would quit playing professionally. And then Blizzard Korea stepped in and verified that she is actually just as awesome as she appears to be. Korean pro-gaming site Inven gave her the opportunity to play on stage with a camera on her screen and mouse and it is really something to see.
This just goes to show how serious Bizzard actually is about cheating, but as they have said in the past:
"…some players are just really good at first-person shooters. Through practice and years of experience, these players’ movements and reaction times can occasionally appear unnatural (if not physically impossible) to those who may not have been exposed to that particular level of play before."
Geguri just happens to be one of those people. And, yes, reportedly those two pro gamers have kept their word and quit the professional scene.
[Source: The Daily Dot]