Stik, Since it's going to be shown on ESPN3, you should be able to still watch it later that night without any issues. Just go to ESPN/Watch/Select Replays and then search for the OU/Portland game. It will then ask you to select your internet provider (mine is Cox) and sign in to watch it free. I have done this in the past...and I just tried it and was able to start watching the OU/Arkansas game without any issues.
You can also just plug in your laptop to your big screen tv with a USB cable if you want!!!