Well, avoiding disastrous misfortune is a form of luck. :)
Joking aside, let's say that preseason I had a 40% chance of winning the cup and a 60% chance of winning the NBBA title. Those are really good chances and probably double those of the next highest competitors, but still only give me a 24% chance of winning the double. So even though I was probably a favorite to win each trophy, I still think it took plenty of luck to win either of them, much less both of them.