If luck isn't on your side, you probably won't succeed in baseball. You can be the most gifted team, the best on paper, the hands down favourites, but if luck isn't going your way, you will struggle. The baseball Gods can be cruel. They can take all your talent and make it worthless.
Cluster luck is a prime example of this. Teams can score more, or less, runs than they are actually capable of due to timing. It's a well documented fact that clutch hitters don't really exist, and, therefore, the timing of hits essentially comes down to luck.