The “30-30” Rule is a boxing strategy that was used by Sugar Ray Leonard in order to cash in on his speed. The basic rule of thumb is that if a fighter can win the first 30 seconds and last 30 seconds of a round, there is a good chance they will win the round on at least one judge’s card. This is because the beginning and the end of a round are what people tend to notice the most. So when you’re watching a fight, keep an especially close eye on fighters during these periods, and you’ll notice you’ll be far more accurate predicting who wins each round.