Good luck is often created by better speed, tactics and boathandling. And so-called bad luck is sometimes an easy excuse for poor preparation or execution. Yet, even in the fairest conditions, there are many factors we cannot control, factors that have a significant impact on each race. Consider the randomness of running over a large plastic bag or debris not visible below the surface or sailing into a big set of powerboat waves at a critical moment in the race. In a series, these unpredictable events will tend to even out, and in a long series, the best team will usually win. In a close series with evenly matched teams, however, the one that gets more "breaks" will triumph.
Trust me, I've been on both sides many times.