Wait NRG still has a chance in the Open? I thought they lost the chance to qualify after losing to Fnatic a few days ago.
Yea, there are actually 2 ways you can get into the playoffs - winning a tournament outright (like EnvyUs, C9, and Fnatic) OR being high in the standings:
http://www.overwatchopen.com/north-america/#/standings/
NRG are already guaranteed a spot in playoffs due to having enough points, though they're trying to get better seeding by winning this last open qualifier.