The second time I played a Pokemon TCG tournament, I decided to run a deck that I hadn't used before that day. It was a five round, single-elimination tournament. It was made harder by the fact that I was put against each of my friends, one at a time. I made it to the final round, and the match lasted an hour and a half. The store itself was within two minutes of closing (and the game would have been declared a draw) when I made the winning play.
It was my first tournament victory.