I found one good weekly review that always has the highlights, but I can't find any place that does comprehensive and in-depths text covers of what happens each round. Any help?
There's a whole lot of Open Cup coverage at thecup.us, though not every game is covered equally well.
...though it's reputable enough that some of the YouTube streams of the Open Cup, posted (so at least endorsed) by the USSF, show the bracket from it as a graphic.