It's a tired cliche, but the game isn't over until the referee blows the final whistle. An unbelievable, historic match at the 2003 FIFA U-17 World Championship proved as much.
As soccer fans, we typically hate to see a game end in a 0-0 tie. But, there is nothing more humiliating than watching one team lose to another by five or more goals. In soccer, it's very important for a team to score the first goal of the game. If that's the case, your team automatically sets the pace for the match, and it also shows your opponents that you are here to compete.