Do you wanna know how GenG won against PRX but lost to Boom in the first week? Yeah the clue is "first week"...
GenG is figuring things out on the first week, that's why Boom can win against them. Now after a week to rethink their game plan, GenG can "luckily" beat PRX
Imagine if the first week's matches are swapped with the second's, PRX could've won against GenG new team and Boom would've lost
So in conclusion, PRX just had an unlucky first two weeks' draw, that's all