^Agreed. You could definitely be edgeguarding a whole lot better. Another thing that would be helpful for you is to watch the last match of the first set. He threestocked you. Now I know this doesn't happen all the time, but this match probably shows a lot of the mistakes that show up every now and then. Take a look and try to figure out on your own why you lost so badly that match--we can't give you all the answers.
But just one thing that might help. Take a look at that match at 7:13. You upsmash and he rolls away. If you upsmash and he goes about that far away and misses the tech like he did, f-smash immediately. It's times like that in which you may have just set up for a tipped f-smash. The upsmash can do that if they DI badly or don't tech. Upsmash isn't a great move to use in general, but if you accidentally use it and that happens, take advantage of the good opportunity.
Edit: Oh, and best way to improve your edgeguarding is just to take a look at professionals playing and if you are using the same techniques to edgeguard--why does it work for them and not for you? You might just be using a good edgeguard at the wrong time. Or you may not be timing it correctly. By watching their matches you can see whether or not you're doing something right. And another thing, if someone is going to Firefox/Firebird really close to the stage there are a few good options if you have the time. You can either run up and f-air, f-tilt, f-smash, or reverse Dolphin Blade. You want to try to take advantage of the time that they're just stalling. Because after that you don't know what direction they're going to go in. But you do know that for about a second they'll be sitting there and can't do anything. Use that time. Even a simple jab is better than waiting because it can lead to an edgehog to b-air or a spike or whatever. As long as you're calling the shots in a time when they're under pressure to make it back to the stage, you'll be doing fine.
Of course you want to be able to react to your opponent, too, but I'm just saying that forcing them to react when they're under such pressure can make them make a stupid mistake.
