I've heard from a few folks wanting clarity on feeds, times, FS1 vs. big Fox, and I haven't had a clear answer.
If you are watching on a tablet, it appears the Fox Sports Go app is the way to go, as the U.S. Open app is only offered in an iPhone version currently. However, that will require a cable subscription login.
And do note the early exclusive usopen.com/app coverage during the first two rounds. Also here is the viewing guide with Golf Channel coverage windows.
So here goes: