Sport photography has little to do with luck.
Sure you have to be lucky in the moment of capture, no matter how fleeting that is and sometimes you feel the luck is heading away from you at great speed, but when a good capture comes, you recognise it for what it is. Luck born of preparation and affirmative action.
What do I mean by that?
To get good sports images (not great though, because I am not there yet), you need to push past safe, to head into the realm of edgy. Your subjects can lead the way here, the better and more exciting ones push their comfort envelope constantly, so it is encumbant on us to do the same.
Early in my career I was happy to just get a sharp shot, but now that is not enough. It has to have intimacy and a feeling of being close to missed, even near impossible for me, to feel satisfied. I want the same feeling of excitement I feel when taking an image to come through.
Shallow depth of field, low angles, shooting into the light, shooting too tight, pushing too close to the action and playing fancy with your angles, are all important elements if you want to go next level.
Always look for a stronger shot.
So, sport photography has everything to with luck, but only after you push that luck as far as you can and employ decent technique.
There is no doubt more and better can be done, but that is the promised reward for extra effort.