ESPN 3 , watch 1 mat on your computer, another mat on your phone, another mat on your tablet if you have one, and if early rounds truly on ESPNU then a 4th mat here. Keep many mats open at once on your computer for quick toggling back and forth. Probably will need to mute all non tv devices so not to hear background noise.
Yeah, I will probably use ESPN3 as my home base and then toggle the ESPN TV channels to see if they are broadcasting what I want to see.
The WatchESPN app has been crystal clear and smooth through Chromecast the past few years (way better than ESPN3 via browser). Careful though, because it is often 30 seconds + behind.