I won as well.
My first round was an easy victory.
The second round match was between some kid, and we were both using each other's controllers (neither of us realized). He drove me off the edge once, we figured out what was going on, and then continued with 30 seconds left (the guy made him run his guy off once to even it, and the kid obliged). I then proceeded to dominate him. Later he tried to argue it wasn't fair, and then got his parents to come over. I said I would've fought him in a rematcht, but the tournament mode was set up so they couldn't do it.
Then my third round concluded with a sudden death between me and Pit. I was Pikachu, and dodged an arrow he shot at me immediately into the sudden death. I then proceeded to casually walk under him (we were on battlefield), and he was waiting for me to do something. I did Down B and killed him instantly.
The fourth round was against some guy who was playing as Ike and owning everyone, but I took him down. He wasn't bad, but he hadn't quite mastered recovering against a dodge.
I forget the final match, but it was against Mario I think. I beat him and got that wrestling trophy and a ticket to the next match. I had to sign all these waivers and stuff after that too. Then I got to play a exhibition with some other kid who got gyped out of his spot. He was Link and I beat him too.