People often conflate luck with statistical deviation. Not saying the OP is doing that, as I agree with what he says, but I think the word 'luck' carries a much different connotation, especially in this context, because it infers that you deserve something that you don't have, or vice versa.
'Knowing how to win' is a phrase that gets tossed around to romanticize results, simple as that. If the 40% three point shooter misses a shot that would have won the game, it's because he doesn't have the clutch gene, not because this happened to be one of the 6 times out of 10 that he was going to miss it. We prefer to think that there is a greater meaning, or life moral, that we can assign to statistical variation, but most of the time there's not.
If UConn hits 15 out of 25 threes and beats Georgetown by 25 on Saturday, they deserve to be commended for it. That doesn't mean we should use that one game as the baseline for what we can expect from UConn moving forward, though.