I personally do not believe in luck. I think luck is an excuse for people that have failed in their mission to do something. If you do your preparation correctly, if you do the work, if you think about things, if you make the correct judgments on the risks that you take and if you stay out of the pits, then you win the race. And that is not luck, that's hard work.
In a perfect world this would be how things worked. It's a combination of luck (good body, mind, and will (i.e. good genes)) and a lot of work and then most likely you will win the race. Things can happen. Someone else can just be better than you.